Julia invests $80,000 in an account which pays 5.97% interest compounded quarterly. After 20 years and 6 months, how much money will she have in the account?

Answer 1

Use: A = P(1-R)^n
80000(1-5.97%/4)^82

we get n (82) from:
4*20years + 4*6months = 24months/2years

quarterly = 4 parts (of a year)

Type that into a calculator and you should get your answer.

Answer 2

Still don't understand how you got 82.