SHORTCUT OF THE DAY
IF a reduction of x% in the price of an article enables a person to buy ‘n’ kg more for Rs A,then the reduced price (Ax/100n) per kg and the original prices (Ax/(100-x)n)per kg of the articles.
Eg:A reduction of 20% in the price of sugar enables a person to buy 2 kg more for Rs 30. Find the reduced and original price of per kg of sugar?
Apply the above shortcut
Reduced price of sugar=30*20/100*2=3 per kg
The original price of sugar=30*20/(100-20)2=15/14=3 ¾ per kg