A reduction of 20% in the price of sugar enables a person to get 7.8Kg more sugar for Rs. 3.90.The original price of sugar per Kg is?
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3.9/7.8=0.5 rs /kg is the reduced price
so 0.5/80*100 =0.625 rs/kg is original price .
Calculation mistakes. Here is the correct one:
20% reduction in Rs. 3.90
= 3.90 * (20/100) = 0.78
Reduced price of 7.8 kg = 0.78
Reduced price of 1 kg sugar = 0.78/7.8 = Rs. 0.1
Then original price = (0.1*100)/80 = 50/4 = Rs. 0.125.
3.90*20/100=78 ....How??
20% reduction in Rs. 3.90
= 3.90 * (20/100) = 78
Reduced price of 7.8 kg = 78
Reduced price of 1 kg sugar = 78/7.8 = Rs. 10
Then original price = (10*100)/80 = 50/4 = Rs. 12.5.
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