A student invests two sums of money at 3% and 4% interest, receiving a total of $110 in interest after 1 year. Twice as much money is invested at 4% than at 3%. Find the amount invested at each interest rate.
Where do I even begin with this?
Begin by calling the 3% money x and the 4% money 2x
.03 x + .04 (2x) = 110