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1986 AMC 12 Question 20

AMC12 · 1986 AMC 12

Question 20

Suppose $x$ and $y$ are inversely proportional and positive. If $x$ increases by $p\%,$ then $y$ decreases by
  1. $p\%$
  2. $\frac{p}{1+p}\%$
  3. $\frac{100}{p}\%$
  4. $\frac{p}{100+p}\%$
  5. $\frac{100p}{100+p}\%$