exam Maths Puzzle Numerical Ability

If the sales tax rate is 2.5% and the tax on a purchase is $5, what was the amount of the purchase?

Can someone help me out with this?
Eddie

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exam Other Question

Dear teacher,

Can you please explain this to me? It is a formula for calculating dimishing depreciation of an asset.

Rate% = 100 x ( 1 - n√r/c ) x 100

n = life in y a contractor has a 24-pound mixture that is no-fourth cement, and three-fourths sand. How much of a mixture that is half cement and half sand needs to be added to produce a mixture that is one-third cement?