First Principles Thinking: Sequential Discounting
A is correct. This problem tests your ability to handle uneven cash flows, which is realistic because most projects do not generate identical amounts each year. Growth businesses often show increasing cash flows as they scale. The NPV formula from first principles: NPV equals negative initial outflow plus the sum of each future cash flow divided by (1 plus discount rate) raised to the power of the time period. Mathematically: NPV = -CF0 + CF1/(1+r)^1 + CF2/(1+r)^2 + ... + CFn/(1+r)^n. Each cash flow is discounted back to present value using the 10 percent discount rate, which represents the cost of capital or opportunity cost. Memory hook: Each year farther out gets hit harder by the discount rate, like compound interest in reverse.
BA II Plus Steps: (1) CF, 2nd CLR WORK. (2) Initial: 200000 +/- ENTER (CF0 = -200,000), down. (3) Year 1: 50000 ENTER, down, down (F01=1), down. (4) Year 2: 60000 ENTER, down, down, down. (5) Year 3: 70000 ENTER, down, down, down. (6) Year 4: 80000 ENTER, down, down, down. (7) Year 5: 90000 ENTER, down, down. (8) NPV, 10 ENTER (I=10), down, CPT. Result: 58,144 (approximately).
Manual calculation to verify: PV1 = 50,000/1.10 = 45,455. PV2 = 60,000/1.21 = 49,587. PV3 = 70,000/1.331 = 52,593. PV4 = 80,000/1.4641 = 54,641. PV5 = 90,000/1.61051 = 55,868. Sum of PVs = 258,144. NPV = 258,144 - 200,000 = 58,144. Since NPV is positive and substantial, accept the project because it creates shareholder value beyond the 10 percent required return. The increasing cash flows make this project attractive; Year 5 alone contributes 55,868 in present value, demonstrating the importance of capturing terminal-year cash flows.
Decision rule: Since NPV is positive and large, accept the project because it creates substantial shareholder value beyond the 10 percent required return. Edge case: If Year 5 had a salvage value or terminal value added to operating cash flow, NPV would be even higher. If cash flows decline instead of rising, NPV would be lower, potentially negative.
B is wrong because 84,487 dollars represents a different scenario or calculator error. Possible errors: entering wrong initial investment, wrong discount rate, or misaligned cash flow frequencies. C is wrong because 150,000 dollars is the undiscounted net cash flow: total inflows of 350,000 (sum of 50+60+70+80+90) minus initial outflow of 200,000 equals 150,000. This commits the fundamental error of ignoring time value of money. A dollar in Year 5 is worth only about 62 cents today at 10 percent discount, not 100 cents.