Engineering Economy: Formula Sheet

Engineering Economy: Formula Sheet

Build a responsible reference sheet of relationships, conditions, units, representations, and decision rules rather than copying unexplained formulas. Evaluates alternatives using cash flows, time value, uncertainty, cost estimation, and economic decision criteria. Course titles, local sequences, grading, safety rules, required tools, and assessment formats vary; align this resource with the current syllabus and instructor directions.

Learning outcomes

• Explain and apply cash-flow diagrams, then connect it to present and future worth using course-appropriate evidence.
• Explain and apply present and future worth, then connect it to annual worth using course-appropriate evidence.
• Explain and apply annual worth, then connect it to rate of return using course-appropriate evidence.
• Explain and apply rate of return, then connect it to replacement and risk analysis using course-appropriate evidence.
• Explain and apply replacement and risk analysis, then connect it to cash-flow diagrams using course-appropriate evidence.

Prerequisite readiness

algebra, percentages, spreadsheets or calculator use, and basic probability Use a short ungraded check, repair the smallest missing skill, and immediately retest it in a course-level task.

Reference-sheet entries

• cash-flow diagrams: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• present and future worth: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• annual worth: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• rate of return: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.
• replacement and risk analysis: record its governing relationship or decision rule, required conditions, units or evidence, one representation, and a common misuse.

Use test

Can you choose the right relationship on an unlabeled task and explain why its conditions hold? If not, the sheet is storage rather than understanding.

Reliable method

define alternatives and study period, estimate cash flows, choose a criterion, calculate consistently, test sensitivity, and document nonfinancial constraints Keep assumptions, intermediate reasoning, units, sources, tool use, and checks visible so another learner can follow the decision process.

Representative application

Compare two equipment options with different lives and maintenance costs while testing interest-rate and usage assumptions. Predict a reasonable result before working, compare the outcome with the prediction, and explain limitations or alternative interpretations.

Error recovery

Watch for mixing nominal and real values, unequal study periods, sunk costs, or precision unsupported by uncertain estimates. Mark the first unsupported move, classify the cause, correct the reasoning, and schedule a fresh mixed recheck after a delay.

Accessibility, integrity, and safety

Use approved accommodations and accessible formats. Follow course rules for collaboration, citation, calculators, software, generative tools, laboratories, clinical settings, field activity, privacy, copyright, and human or animal subjects. Never use Exams.fit to obtain protected questions or bypass assessment rules.

Evidence to save

When permitted, preserve an alternative analysis with cash-flow diagram, calculations, sensitivity, and recommendation with the prompt, first attempt, feedback, revision, verification, and reflection. Remove restricted assessment content and private or proprietary information.

Open-learning reference

Compare this original Exams.fit resource with the relevant OpenStax collection and MIT OpenCourseWare when they match the local course. Reviewed August 2, 2026. This page does not replace the current syllabus, instructor, institution, or qualified professional.