SOLUTION: Last year, Maria had $30,00 to invest. She invested some of it in an account that paid 5% simple interest per year, and she invested the rest in an account that paid 9% simple

Question 1121989: Last year, Maria had $30,00
to invest. She invested some of it in an account that paid 5%
simple interest per year, and she invested the rest in an account that paid 9%
simple interest per year. After one year, she received a total of $1780
in interest. How much did she invest in each account?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
x=amount at 5%
30000-x=amount at 9%
.05x+.09(30000-x)=1780
.05x+2700-.09x=1780
-0.04x=-920
x=$23000 at 5%=$1150
30000-x=$7000@9%=$630
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