Question 48608
.11x+.12(10,000-x)=1,115 or .11x+1,200-.12x=1,115 or -.01x=-85 or x=85/.01 or 

x=8,500 invested @ 11% & 10,000-8,500=1,500 @ 12%.

proof .11*8,500+.12*1,500=1,115 or 935+180=1,115 or 1,115=1,115