A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.100, find the original price per kg ?



A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.100, find the original price per kg ?

A. 2 3/2

B. 2 2/3

C. 2.5

D. 3

Answer : C. 2.5


Explanation:

    It is based on inverse proportion or product constancy concept. Reduction in price 20% amount of salt will increase 25%.
    25% is equivalent to 10 kg
    So, total salt = 10 * 4 = 40
    Original price of the salt is, 100/40 = 2.5 kg



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