book Maths Puzzle Numerical Ability

How much money should be invested in an annual interest rate of 8% in order to earn $250 of yearly interest?

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A metal sheet measuring 14inch by 17imch will have square corners of length x cut from it. If the area of the base is to measure 130inch squared, what are the length, width, and he What is the proof for this logarithmic identity using A) exponential functions and b) logarithmic properties
(loga x)(logb a) = logb x