exam Maths Puzzle Numerical Ability

Solve the following application.
Statistics. A survey of 400 people found that 66 were left-handed. What percent of those surveyed were left-handed?

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exam Other Question

Solve. (x+4)(x-5)(x+3)>0

What is the solution set? {x }

Thank you I really need help with this!!! If you deposit $250 each quarter in a bank account that pays interest at 16% compounded quarterly, how much will you have at the end of five years?