19,000$, 1 yeer, interest=1,230$... 1230/19000=0.064736842...6.47368%... sum at 5% & sum at 7%...0.05x +0.07*(19000-x)=1230... 0.05x -0.07x +1,330=1230... -0.02x =1230-1330=-100... x=-100/-0.02=+100/0.02 =5,000$ at 5%... & 14,000$ at 7%=980$... 5000$ at 5%=250$... 980$+250$=1230$