Question 672316
let tony invested $x at 7% simple interest pa, and $20000-x at 5% simple interest pa
as per question 7x/100+5(20000-x)/100=1040
or 7x+5(20000-x)=1040*100=104000
or 7x+100000-5x=104000
or 2x=4000
or x=2000
so tony invested $2000 at 7% simple interest pa, and $18000 at 5% simple interest pa
ans