Correct option is C
Given:
Price drop of 25%, she can now buy 1 kg more
Solution:
Let original price of the sugar 1 kg be Rs. 4x
=> Price of 1 kg sugar after decrease = 4x × 3/4 = Rs. 3x
According to the question
30/3x – 30/4x = 1
=> (4 – 3)/12x = 1/30
=> 1/12x = 1/30
=> x = 30/12
=> x = 2.5
∴ Original Price of 1 kg sugar = 4 × 2.5 = Rs. 10
Other method
Ratio of price original to after = 4 : 3
Consumption of sugar original to after = 3 : 4
4 – 3 = 1 unit
=> 1 unit = 1 kg
=> 3 unit = 3 kg
∴ Original cost price of 1 kg sugar = 30/3 = Rs. 10
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