Can someone help me with a couple of math problems? -

Otay, Heres the problems and stuff Information given; Marcus has $1,800 from his summer job to invest. Questions; 1: Suppose he invests the $1,800 for 2 years and earns $144. What was the rate of interest? 2: Marcus would like to have $2,340 altogether. If he invests his money at 5% interest, in how many years will he have $2,340? Heehee Thankies! ^_^|::::|1 - 7 2 - 77|::::|what he said