Joanne sells silk-screened T-shirts at community festivals and craft fairs. Her marginal cost to produce one T-shirt is $2.50. Her total cost to produce 80 T-shirts is $290, and she sells them for $6 each. a. Find the linear cost function for Joanne's T-shirt production. b. How many T-shirts must she produce and sell in order to break even? c. How many T-shirts must she produce and sell to make a profit of $800? a. The linear cost function is C(x) = 2.50x + 90. b. Joanne must produce and sell T-shirts in order to break even