Problema Solution
Marcus earned $6000 during his summer vacation. He invested part of the money at 8% and the rest at 7% If he received a total of $459 in interest at the end of the year, how much was invested at 8%
Answer provided by our tutors
let
x = the money invested at 8%
y = the money invested at 7%
Marcus earned $6000 during his summer vacation
x + y = 6000
he received a total of $459 in interest at the end of the year
0.08x + 0.07y = 459
by solving the system of equations
x + y = 6000
0.08x + 0.07y = 459
we find
x = $3,900
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he invested $3,900 at 8%.