Suppose a company manufactures two types of wood-burning stoves: a freestanding model and a fireplace-insert model. The cost function for producing x freestanding and y fireplace-insert stoves is 
. Find the marginal costs 
when 
and 
. Round your answer to the nearest integer.
Definitions:
Catalogue
A comprehensive list or inventory, often detailed and organized, of items for sale or collection.
Breach of Contract
An infringement or violation of the terms agreed upon in a contract, resulting in legal liability.
Counter-Offer
A proposal made in response to a previous offer, differing in terms and suggesting a new agreement.
Zoned Duplex
A residential building divided into two units with separate entrances, located in an area designated by zoning laws for such structures.
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