A shopkeeper sold a box at a profit of 30 if he purchases it by 20 less and sold it at 40 profit so ...........

Quantitative Aptitude ( CCS) Number System

A shopkeeper sold a box at a profit of 30% if he purchases it by 20% less and sold it at 40% profit so he earns 144 Rs. less. What is the C.P. of that box?

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Explanation:

Let C.P. = 100, S.P. = 130
Now, C.P. = 80, S.P. = 80×140%= 112
Now he earn 144 Rs. less
130-112 = 18 Rs.
If he earns 18 Rs less, than C.P. = 100
If he earns 144 Rs. Less, than C.P. = 100/18×144
C.P. = 800 Rs.