$12000 is separate in to 2 investments. One investment took the 9% detriment though done an 11% distinction upon the other. In the end, the financier was happy his earning were only sufficient to cover his loss. How most was investment during any rate?
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the two investments are X and 12000-X
one X lost 9%
12000-X made 11%
and the amount lost is equal the amount gained
9%X = 11%(12000-X)
9%X = 1320-11%X
20%X = 1320
X=6600 invested at 9%
12000-X = 5400 invested at 11%