Using the the compound

Question

Using the compound intterest formula:A=P(1+r)^t . How do I solve for t or r? 

1. A=$2500,P=2000,t=5

2.A =$1500,P=$1000,r=4%

Answer 1

In problem # 2,since t is an exponent, you need to solve this problem by taking logarithms; all of the other quantities are known numbers.