If x at 10%, the rest (8900-x) at 9%, then calculate the interest:
.10x + .09(8900-x) = 831
x = 3000
A college student earned $8900 during summer vacation working as a waiter in a popular
restaurant. The student invested part of the money at 10% and the rest at 9%. If the student
received a total of $831 in interest at the end of the year, how much was invested at 10%?
1 answer
1 answer