Question 718503
An investor has a total of $25,000 deposited in three different accounts, which earn annual interest rates of 8%, 6%, and 4%. The amount deposited in the 8% account is twice the amount in the 6% account. If the three accounts earn total interest of $1,520, how much money is deposited in each account.

let amount invested at 6% be x
8%-----------2x

Balance at 4%

4%-----------(25000-3x)

6%*x +8%*2x +4%(25000-3x)=1520

multiply equation by 100

6x+16x+100,000-12x=152000

10x=152000-100000

10x=52000
x= 5,200-----------6%
2x=10,400----------8%
8,400--------------4%

Check

6%*5,200 +8%*10,400 +4%*9,400= 1520