Solving for the Interest Rate (I/Y) Solving for I/Y means solving for the interest rate that balances the present and future values of a lump sum across n years using this formula: -- 1 What interest rate is required to make $100 grow to $150 in five years? Enter the data into your calculator: N un PV - 100 PMT 0 FV 150 Solve for I/Y by pressing CPT I/Y. LY Grade It Now Save & Continue Continue without saving Solving for the Interest Rate (I/Y) Solving for 1/4 means solving for the interest rate that balances the present and future values of a lump sum across n years using this formula: T What interest rate is required to make $100 grow to $150 in five years? Enter the data into your calculator: N 5 6.80 -100 0 7.65 150 17.05 8.45 Solve y pressing CPT I/Y 8.10 1/4 = Grade It Now Save & Continue Continue without saving