I'm unsure of how to solve for part b and subsequently part c.

31. Consider $100 in a bank account that has annual interest rate of 20%. Compute the amount in the bank account one year later if the money is compounded once a year, twice a year, and four times a year. b. Find an expression for the amount of money in the bank account if the money is compounded n times a year. a. c. Evaluate this expression for larger and larger n and estimate the value it appears to be approach- ing