Explanation : 20% reduction on Rs 600 means benefit of RS 120 to a
customer. That enables customer to buy 2 kg extra
article.
Thus reduced selling price of 2 Kg = Rs 120 and of
one Kg = 120/2 = Rs 60
If a value reduces by 20%, it means it should be
increased by 25% to reach at original value again.
Thus original price = 60 + 25% of 60 = Rs 75