SOLUTION: 4.[5pts]Last year, Singh had $20,000 to invest. He invested some of it in an account that paid 7% simple interest per year, and heinvested the rest in an account that paid 6% simp

Question 1147225: 4.[5pts]Last year, Singh had $20,000 to invest. He invested some of it in an account that paid 7% simple interest per year, and heinvested the rest in an account that paid 6% simple interest per year. After one year, he received a total of $1280 in interest. How much did he invest in each account?
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.


Let x be the amount in dollars invested at 7%.


Then the rest (10000-x) dollars is the investment at 6%.


total interest is the sum of partial interests


    0.07x + 0.06(20000-x) = 1280 dollars, 


Do the rest on your own.

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