a) PQ
b) $$\frac{{{\text{PQ}}}}{{100}}$$
c) $$\frac{{\text{P}}}{{\text{Q}}}$$
d) $$\frac{{\text{Q}}}{{\text{P}}}$$
Answer: b
Explanation:
$$\eqalign{
& \frac{{\text{P}}}{{100 + {\text{P}}}} = \frac{{\text{Q}}}{{100}} \cr
& 100\left( {{\text{P}} – {\text{Q}}} \right) = {\text{PQ}} \cr
& \left( {{\text{P}} – {\text{Q}}} \right) = \frac{{{\text{PQ}}}}{{100}} \cr} $$
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