exam Maths Puzzle Numerical Ability

Find the height and base of a parallelogram given its area = 100 square units, the base = x + 15.

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Could you help with this problem?
I have to use numbers 1 through 9 to equal 100 using order of operations.
_ divide _ X _ + _ X _ X _ divide _ + _ X _ = 100.
I don't have a ISB Elisha invested $12,000 for one year, part at 3% and part at 4 3/4%. If she earned $438.40 in interest, how much was invested at each rate?