Problema Solution
Mrs. Santos invested 18000 , apart of it will give her 18% interest rate and the remaining will be 22% the income at 18% will be 840 more than the other. How much amount invested at each rate ?
Answer provided by our tutors
let
x = the money invested at 18% interest rate
y = the money invested at 22% interest rate
Mrs. Santos invested 18000
x + y = 18000
the income at 18% will be 840 more than the other
0.18x = 840 + 0.22y
by solving the system of equations
x + y = 18000
0.18x = 840 + 0.22y
we find
x = $12,000
y = $6,000
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Mrs. Sants invested $12,000 at 18% interest rate and $6,000 at 22% interest rate.