exam Maths Puzzle Numerical Ability

I really need some minor help on this problem.

Teachers comments: Per task instructions, this explanation of the mathematical operations should be without mathematical symbols.

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exam Other Question

The amount of annual interest earned by $8,000 invested at a certain rate is $200 less than $12000 would earn at a rate 1% lower . At what rate is the $8000 invested? Paul invested $12,000 some at 14% annual interest and the rest at 10%. Last year he earned $1632 in interest. How much money was invested at each rate?

Thanks so much for any help.