book Maths Puzzle Numerical Ability

Can you pl;ease tell me if I have done this problem correctly? I just feel like is is off. The problem is as follows:

A sum of $2000 is split between two investments, one paying

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slove this INEGUALITY 3q+11+8q>99 clear fractions and decimals, solve and check
1/2+4m=3m-5/2

i am really stuck on how to solve it properly the denominater 2 is under the 1 and the denominater 2 is under the 5