First, disregard the typo 20,000 instead of 20,0000. I plugged these numbers into my calculator and got a completely different answer. I got -13,099.12. Anyone know what this mistake may be? Where did I go wrong? And is there a way to solve this using formulas instead of simply relying on the calculator?

I start working on my first job. I realize I need $20,000 in 3 years to buy a new car. If I can earn 4.7% annually how much do I need to invest today? CO Ans: FV 20,0000; I/Y 4.7; N 3; CPT PV -17,425.69