SOLUTION: A person plans to invest four times as much in an account at 4.7​% interest as in an account at 8.4​% annual interest. How much should the person invest in each account
Question 1090242: A person plans to invest four times as much in an account at 4.7% interest as in an account at 8.4% annual interest. How much should the person invest in each account to earn a total of $408 in one year? Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website! .
Your equation is
0.047*(4x) + 0.084x = 408 dollars (where x is the amount at 8.4%)
To make things easier, multiply both sides by 1000 to get
47*4x + 84x = 408000.
From this point, completing the solution is easy arithmetic.
I leave it to you.