Explanation

Let’s say you originally have $100, and the original price per unit is $1. You can buy:

Before price drop: $100 ÷ $1 = 100 units

A 60% price decrease means the new price is:

New price = $1 - 60% of $1 = $0.40

After price drop: $100 ÷ $0.40 = 250 units

So, the increase in quantity is:

250 - 100 = 150 units more, which is a 150% increase.