GELE Mathematics — Engineering EconomyConcept Map
Concept maps turn Engineering Economy from a list of facts into a connected picture. For GELE Mathematics, this visual makes it easier to see how Engineering Economy relates to other chapters Professional Regulation Commission (PRC) — Board of Geodetic Engineering tests in the same paper.
Exam context
On the GELE 2026, the Mathematics subtest carries a "Core" weight in Professional Regulation Commission (PRC) — Board of Geodetic Engineering's pattern. Engineering Economy lands at position 10th out of 10 in the standard review order. Target score is 70% weighted average, no sub-test below 50%, and roughly a meaningful share of items come from Mathematics on a typical GELE paper.
Engineering Economy - Concept Map
Central Concept
Engineering Economy: Decision-Making on Economic Alternatives over Time
Related Concepts
Concept
Time Value of Money
Sub Concepts
- Simple Interest
- Compound Interest
- Present Worth
- Future Worth
- Nominal vs Effective Rates
Relationship To Central
Foundation principle underlying all economic calculations
Concept
Interest and Compounding
Sub Concepts
- Period Interest Rate (i)
- Number of Periods (n)
- Compounding Frequency (m)
- Continuous Compounding
- Effective Annual Rate (EAR)
Relationship To Central
Core mechanism for time-value calculations
Concept
Annuities and Uniform Series
Sub Concepts
- Ordinary Annuity (End-of-Period)
- Annuity Due (Beginning-of-Period)
- Future Worth of Annuity
- Present Worth of Annuity
- Perpetuities
Relationship To Central
Methods to evaluate recurring equal payments
Concept
Depreciation Methods
Sub Concepts
- Straight-Line (SL)
- Sum-of-Years-Digits (SYD)
- Declining Balance (DB)
- Book Value Calculation
Relationship To Central
Reduces asset value systematically for accounting and tax purposes
Concept
Economic Comparison Methods
Sub Concepts
- Present Worth (PW)
- Annual Worth (AW)
- Rate of Return (ROR)
- Payback Period
- Benefit-Cost Ratio (B/C)
Relationship To Central
Techniques to select best alternative based on economic merit
Concept
Cash Flow Analysis
Sub Concepts
- Initial Investment
- Operating Costs
- Salvage Value
- Net Cash Flow
- Cash Flow Diagrams
Relationship To Central
Organizes project costs and benefits chronologically
Concept
Break-Even Analysis
Sub Concepts
- Break-Even Point
- Sensitivity Analysis
- Variable Costs
- Fixed Costs
Relationship To Central
Determines point where two alternatives are economically equivalent
Concept
Loan and Debt Analysis
Sub Concepts
- Loan Principal
- Interest Calculations
- Amortization Schedules
- Effective Interest Rate
Relationship To Central
Evaluates financing options and repayment obligations
Concept Connections
To
Compound Interest
From
Time Value of Money
Strength
strong
Relationship
Compound interest is the primary mathematical mechanism implementing time-value principles
To
Present Worth
From
Compound Interest
Strength
strong
Relationship
Present worth uses discounting (inverse of compound interest) to bring future values to today
To
Time Value of Money
From
Annuities and Uniform Series
Strength
strong
Relationship
Annuity formulas apply compound interest principles to recurring equal payments
To
Economic Comparison Methods
From
Depreciation Methods
Strength
moderate
Relationship
Depreciation affects taxable income and cash flows used in economic analyses
To
Present Worth
From
Economic Comparison Methods
Strength
strong
Relationship
Present worth is one of the primary methods for comparing alternative investments
To
Annual Worth
From
Economic Comparison Methods
Strength
strong
Relationship
Annual worth converts all costs to equivalent annual amounts for easy comparison
To
Present Worth
From
Cash Flow Analysis
Strength
strong
Relationship
Present worth analysis requires proper organization and timing of all project cash flows
To
Economic Comparison Methods
From
Break-Even Analysis
Strength
moderate
Relationship
Break-even identifies the point where two alternatives have equal economic merit
To
Nominal vs Effective Rates
From
Interest Mechanisms
Strength
strong
Relationship
Effective rate converts nominal rate to true periodic rate for different compounding frequencies
To
Annuities and Uniform Series
From
Loan and Debt Analysis
Strength
strong
Relationship
Loan repayments are typically modeled as ordinary annuities with calculated interest
To
Present Worth
From
Rate of Return
Strength
strong
Relationship
Rate of return is found by solving for interest rate where PW equals zero
To
Present Worth
From
Benefit-Cost Ratio
Strength
strong
Relationship
B/C ratio uses present worth of benefits divided by present worth of costs
To
Depreciation Methods
From
Straight-Line Depreciation
Strength
strong
Relationship
Straight-line is the simplest and most commonly used depreciation method
To
Accelerated Depreciation
From
Sum-of-Years-Digits
Strength
strong
Relationship
SYD is an accelerated method that front-loads depreciation in early years
To
Annuities and Uniform Series
From
Perpetuities
Strength
moderate
Relationship
Perpetuity is a special annuity with infinite number of periods
To
Economic Comparison Methods
From
Payback Period
Strength
weak
Relationship
Payback period is a simple but limited method measuring initial recovery time
To
Loan and Debt Analysis
From
Amortization Schedules
Strength
strong
Relationship
Amortization schedules show period-by-period breakdown of principal and interest payments
To
Cash Flow Analysis
From
Initial Investment
Strength
strong
Relationship
Initial investment is the starting point of any project cash flow analysis
To
Depreciation Methods
From
Salvage Value
Strength
strong
Relationship
Salvage value is subtracted from capital cost to determine depreciable amount
To
Break-Even Analysis
From
Sensitivity Analysis
Strength
moderate
Relationship
Sensitivity analysis examines how decision changes when key variables vary
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