A total of $3800 is invested into two accounts paying 4% and 7% annual interest. In one year the combined interest on the accounts is $218.

Find the amount invested at 4%.

To find the money you make, take:

x (1 ( + or - ) % interest rate) * Time

So in this case, it would be:

3800 (1+0.04) (1) = Ans

and

3800 (1+0.07) (1) = Ans

Assumably, combining those totals would give you $218. If you take the total of 3800 (1+0.04) (1), subtract that from $218.

218 - (3800 (1+0.04) (1)) = Your Answer