A book seller sold a box of 10 pencils for Rs 80 and incurred a loss Had he sold it for Rs 98 his ga...........

Quantitative Aptitiude (CLAT) Profit and loss

A book seller sold a box of 10 pencils for Rs. 80 and incurred a loss. Had he sold it for Rs. 98, his gain would have been twice the loss he incurred earlier. The cost price of the box of pencils is:

rs. 84

rs. 86

rs. 88

rs. 90

Explanation:

98-80 =18.
loss:profit =1:2
18 is divided in that ration we get 12 as profit and 6 as loss .
80+6=86.or 98-12 =86
OR
Let CP be X. Then,
98-X = 2(x-80)
=> 3X= 160+98 = 258
=> X = 86*
It's a proper approach.