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

3x+2y=22 2x+3y=23 using the simultaneous method find the values of x and y which satisfy the equation The equation of the line that goes through the point(3,4) and is parallel to the line going through the points (-6,6) and (1,3) can be written in the form y=mx+b where
m=
b=
I am having difficulty with the second part only m=-3/7