On selling 17 balls at Rs., 720 , there is a loss equal to cost price of 5 balls. cost price of a ba

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7.Profit and Loss

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On selling $17$ balls at $Rs.\, 720$, there is a loss equal to the cost price of 5 balls. The cost price of a ball is (in $Rs.$)

A

$45$

B

$50$

C

$55$

D

$60$

Solution

$S.P.$ of $17$ balls $=₹ 720$

(C.P. $-$ S.P.)of $17$ balls $=$ $C.P.$ of $5$ balls

$\therefore$ $S.P.$ of $17$ balls $=$ $C.P.$ of $(17-5)$ balls

$=$ $C.P.$ of $12$ balls $=720$

$\therefore$ $C.P.$ of ball $=\frac{720}{12}=Rs. 60$

Standard 13

Quantitative Aptitude

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