exam Maths Puzzle Numerical Ability

A sales commission on a $12,500 car is $625. what is his rate of commission?

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exam Other Question

(x-4)
______
(x/4)-(4/x)

that line makes it a fraction. please simplify this complex fraction. thanks.
The equatiopn of a circle is x^2 + y^2 = 50. the region enclosed by the circle is also divided into two parts. find the area of the smaller one.

thnx!