book Maths Puzzle Numerical Ability

Sally has $32,000, she invested part at 9% return and the remainder at 11% return. Her total return was $3200, what is the investment breakdown? How do you set this equation?

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I can't seem to make out how to do this problem. it is so confussing. the problem is:
-7.5xs-0.9=-5.7x+4.5 Your cost in manufacturing a set of specialized toy blocks consists of a setup expense of $20 plus $0.20 per block. Let C be the total cost of producing a set of blocks, and let x