The original price p of an item less a discount of 20%

⇒First Approach

Let $x be the Marked price of an Item.

Discount =20%

Original Price after Discount = $p

⇒Marked price of the Item

⇒Second Approach

If, p=Original Price of the Commodity

Discount =20%

Price after Discount

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.