1 Principal, beginning dollar amount interest rate in decimal form — number of times the interest is compounded annually (annually = 1, semiannually = 2, quarterly = 4, monthly = 12) Easy/Medium Compound Interest Problems ending dollar amount — principal, beginning dollar amount 271 constant interest rate in decimal form years years Example 1 $000 62% so use 0062 inInterest calculator for a $250k investment How much will my investment of 250,000 dollars be worth in the future? A 3 300.00 principal earning 4 interest compounded annually after