Hayden invested $750 for 3 years at an interest rate of 0.035 how much interest did he earn in that time

78.75 (simple) 81.54 (compound)

Step-by-step explanation:

Simple interest without compounding : I = P * (1 + rt) - P

I: interest P: primary investment r: annual rate t: time in year

I = = 750 * (1 + 0.035*3) - 750 = 78.75

Compound interest I = (P * (1 + r) ^ t) - P

I' = 750 * (1+0.035) * (1+0.035) * (1+0.035) - 750 = 81.54