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A discount series of p %\ a n d\ q % on ...

A discount series of `p %\ a n d\ q %` on an invoice is the same as a single discount of `[p+q+(p q)/(100)]%` b. `[p-q+[(p q)/(100)]%` c. `100-[p+q+(p q)/(100)]%` d. none of these

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The correct Answer is:
`{(p+q)-(pq)/(100)}%`
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