A savings account pays rate percent interest once a year, added to the balance. Write compound_balance(principal, rate, years) that returns the balance after years years, rounded to 2 decimal places.
Examples
Input: principal = 1000, rate = 5, years = 2
Output: 1102.5
Explanation: 1000 -> 1050 -> 1102.5
Input: principal = 500, rate = 10, years = 1
Output: 550.0
Input: principal = 1000, rate = 0, years = 10
Output: 1000.0
Constraints
0 <= principal <= 10**60 <= rate <= 100(may be a float)0 <= years <= 100
Goals
- Turn a percentage rate into a growth factor
- Use `**` for repeated growth
- Round money to 2 decimals