Aman invests a certain amount of money at 2% interest and $800 more than that amount in another account at 4% interest. at the end of one year he earned $112 in interest. how much money was invested in each account? which of the following equations could be used to solve the problem?

a) 0.02x + 0.04(800) = 112
b) 0.02x + 0.04(x + 800) = 112
c) 0.04x + 0.02(x + 800) = 112