Ann splits an investment of $54000 , a portion earning simple interest at a rate of 3.4 % per year and the rest earning at a rate of 8.4 % per year in such a way that the return on the total investment is 7.4 %. How much money was invested at each rate? (Round to the nearest 100 dollars.)

At rate 3.4 % :
At rate 8.4 % :