Calculate compound interest using the formula: A = P(1 + r/n)^(nt) where:

  • A = final amount
  • P = principal (initial amount)
  • r = annual interest rate (as decimal)
  • n = number of times interest is compounded per year
  • t = time in years

Your method should accept principal, rate (as percentage), time in years, and compounding frequency, then return the final amount rounded to 2 decimal places.

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