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A reduction of 10% in the price of salt enables a person to buy 2 kg more for Rs.180. Find the reduced and the original price per kg of salt respectively.
- ARs 6, Rs 7
- BRs 7, Rs 8
- CRs 8, Rs 9
- DRs 9, Rs 10
Correct answer: D
Discussion 1
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CCommunity
Rs 9, Rs 10
Let originally he buy X kg for Rs. 180
Now, he will buy X+2 kg for Rs. 180.
Reduction in original price =10%
(180/X)/kg*90/100 = [180/(X+2)]/kg
90(X+2) = 100X
X = 18
Therefore, Originally he bought 18 kg.
Original Price = Rs. 10/kg
Reduced Price = Rs. 9/kg
Let originally he buy X kg for Rs. 180
Now, he will buy X+2 kg for Rs. 180.
Reduction in original price =10%
(180/X)/kg*90/100 = [180/(X+2)]/kg
90(X+2) = 100X
X = 18
Therefore, Originally he bought 18 kg.
Original Price = Rs. 10/kg
Reduced Price = Rs. 9/kg