Explanation

Since the shop sells the pair of shoes for Rs. 800 after a 20% discount, that means the discount amount is 20% of the original price.

Discount amount = 20% of x = 0.20x

The selling price (Rs. 800) is the original price minus the discount amount:

800 = x - 0.20x

Simplify the equation:

800 = 0.80x

Divide both sides by 0.80:

x = 800 / 0.80

x = 1000

So, the original price for the pair of shoes was:

Rs. 1000

The correct answer is: Rs. 1000