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A person buys an article for Rs. p and s...

A person buys an article for Rs. `p` and sells it for Rs. `q` thereby gaining `r %` . The selling price in terms of cost price may be written as `(p r)/(100)` b. `(r(100+p))/(100)` c. `(p(100+r))/(100)` d. `(p(100-r))/(100)`

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