After 5 years, marcels account earned $ 600 in interest. If the interest rate is 0.03, how much did marcel initially invest?

Answer 1

I = Prt

600 = P * 0.03 * 5

600 = 0.15P

600 / 0.15 = P

Answer 2

After 20

years, Marcel's account earned $1200
in interest. If the interest rate (in decimal form) is 0.1

, how much did Marcel initially invest?