The compound interest formula is:

where A is the final amount, P is the principal, r is the annual interest rate (as a decimal), n is the number of times interest is compounded per year, and t is time in years.
Substituting with P = $41.67, r = 0.045 (=4.5/100), n = 365 (the interest is compounded daily), and t = 3 years, we get:
