A) Rs. 50 per kg
B) Rs 10 per kg
C) Rs. 40 per kg
D) Rs. 5 per kg
Correct Answer: B
Solution :
Let the original price of rice be Rs. x per kg New price = Rs. (\[x-20%\]of x) = Rs. \[(x-0.20x)\]= Rs. 0.80 x Saving on Rs. 100 = 20% of 100 = Rs. 20 New price of 2 kg rice \[=2\times 0.80\]= Rs. 1.6x These additional 2 kg of rice bought out of saving due to reeducation in price of the rice, So, \[1.6x=20\] \[x=\frac{20}{1.6}=\frac{200}{16}\]=Rs. 12.5 Old price of rice per kg = Rs. 12.5 New price of rice per kg \[=12.5\times 0.80\]= Rs. 10
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