You and a friend want to start a business and design t-shirts. you decide to sell your shirts for $15 each and you paid $6.50 a piece plus a $50 set-up fee and $25 for shipping. how many shirts do you have to sell to break even? round to the nearest whole number.

you're selling the t-shirts at $15 a pop, so if you sell say Q quantity of shirts, your Revenue is 15Q.

your costs are a one-time setup fee of 50 bucks plus 25 bucks for shipping, so 75 bucks fixed cost, and you paid $6.50 to make each t-shirt, so if you make Q quantity of shirts, your costs will then be the 75 bucks plus 6.5Q.

the break-even point is where the revenue = costs, namely where R(Q) = C(Q).

we used 8, because we can't use 9, since it's less than 9 shirts, is 8.8, then again 8.8 shirts is 8 shirts and then you grab another one and ripped it up by 0.8, which we're not going to do, well, unless one client wants that.

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