Joanne sells silk-screened T-shirts at community festivals and craft fairs. Her marginal cost to produce one T-shirt is
$3.50. Her total cost to produce 80 T-shirts is $370, and she sells them for $7 each.
a. Find the linear cost function for Joanne's T-shirt production.
b. How man 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?
