GRE Exam Numerical Ability Percentage

A particular stock is valued at $40 per share. If the value increases 20 percent
and then decreases 25 percent, what is the value of the stock per share after
the decrease?

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GRE Other Question

If an athlete's weight decreases from 160 pounds to 152 pounds, what is
the percent decrease?
What is the value of the function defined by f(x)=3x^2+7x+23, When x=2?