Question 54240
5,730=.13x+.04(69,000-x) or 5,730=.13x+2,760-.04x or 5,730-2,760=.13x-.04x or 2,970=.09x or x=2,970/.09 or x=33,000 invested @ 13% & 69,000-33,000=36,000 invested @ 4%

proof 33,000*.13+36,000*.04=5,730 or 4,290+1,440=5,730 or 5,730=5,730