Find the exact value of the given expression using a sum or difference formula. 
Definitions:
Market Price
Market Price is the current price at which a good or service can be bought or sold in a marketplace.
Competitive Price-Taker
A market participant who must accept the prevailing market prices because they have no influence over those prices due to their small market share.
Average Total Cost
The total cost of production divided by the quantity of output produced, representing the average cost per unit of output.
Homogeneous Products
Goods that are identical in quality and cannot be distinguished from one another by consumers.
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