Posted by joe blow on .
Hassan deposited $7,500 into a bank account. At the end of 3 years, the account had earned $900 in simple interest. What rate of interest did the account earn per year?

algebra 
helper,
900/3 = 300/yr
300/7500 = .04
Or
PRT = I
R = I/PT
R = 900/(7500 * 3)
R = .04 = 4%