Explanation

To find the original price of the shirt, let's denote the original price as x. Since the price increased by 20%, the new price is 120% of the original price, or 1.2x.

Given that the new price is Rs. 480, we can set up the equation:

1.2x = 480

To solve for x, divide both sides by 1.2:

x = 480 / 1.2

x = 400

So, the original price of the shirt is 400.