What is the percent increase modeled in the function f(x)=20(1.5)^x a)20% b)1.5% c)30% d)50%

The increase is D: 50% because the 1 in the parentheses stands for the 20 that was already there, with the .5 being the amount that’s actually being increased. 0.5 translates to 50%, so the answer is D.