The purpose of this thread is to highlight the question posed in the title: does this answer make sense?
When you’re working problems in Quants, that’s the question you should ask yourself after every calculation: is my answer sensible? You don’t want to learn just the mechanics of the calculations; you want to develop a feeling for the right answer.
In another thread, I posed an NPV problem: $100,000 cost, four annual cash flows of $30,000, discount rate of 7%. What’s the NPV?
Before you do any calculations, think about what a reasonable answer would be. If the discount rate were 0%, then you’d just add the numbers and get $20,000. But you’re discounting the cash flows, so the answer should be something less than $20,000. Could it be negative? Possibly. Could it be -$40,000? Unlikely; you’d need the present value of $120,000 in cash flows to be only $60,000; that’s a huge discount in only four years. I’d submit that something between -$20,000 and +$10,000 is reasonable. Now, do the calculation.
The only way to develop a feel for this stuff is to try. Guess at the answer before you calculate it; give yourself a reasonable range, then see if you’re correct. The more you do this, the better you’ll become at it.
And then, on the exam, when you calculate an answer that makes no sense, you’ll know that you goofed up the calculation: hit a wrong button or something. Believe me, it’ll be a lot less frustrating than thinking you did everything right and getting an answer that isn’t close to any of the choices offered.