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A Shopkeeper Bought Locks at the Rate of 8 Locks for Rs.520 and Sold Them at the Rate of 12 Locks for Rs.936. Calculate His Gain Or Loss Percent and the Number of Locks He Should Sell to Earn - Mathematics

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Question

A shopkeeper bought locks at the rate of 8 locks for Rs.520 and sold them at the rate of 12 locks for Rs.936. Calculate his gain or loss percent and the number of locks he should sell to earn a net profit of Rs.520.

Sum
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Solution

Cost of 8 locks = Rs.520
∴ C.P. of 1 lock
= Rs.`(520)/(8)`
= Rs.65
Selling price of 12 locks = Rs.936
∴ S.P. of 1 lock 
= Rs.`(936)/(12)`
= Rs.78
∵ S.P. > C.P.
Profit 
= S.P. - C.P.
= Rs.(78 - 65)
= Rs.13
Profit%
= `"Profit"/"C.P." xx 100`

= `(13)/(65) xx 100`
= 20%
Net profit = Rs.520
∴ Number of locks sold
= `"Total profit"/"profit per lock"`

= `(520)/(13)`
= 40.

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Chapter 2: Profit , Loss and Discount - Exercise 2.1

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Frank Mathematics [English] Class 9 ICSE
Chapter 2 Profit , Loss and Discount
Exercise 2.1 | Q 9
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