Answer
a)
Linear Cost Function
C(x) = Vx + FC
Where C(x) is the Total cost of producing x number of units
FC is the Fixed Cost
V is the Variable Cost per unit and X is the number of units produced
So, Vx is the Variable Cost of producing x number of units
Variable Cost per unit = $4.50 (given) i.e marginal cost of producing one unit
Now,
Total cost of producing 50 T-shirts = $285 (given)
So,
C(50) = FC + V(50)
$285 = FC + ($4.50 * 50)
$285 = FC + $225
FC = $60
Fixed Cost is $60
So, Linear Cost Function is
C(x) = 4.50x + 60
b)
Selling Price per unit = $9 (given)
So,
Revenue Function
R(x) = 9x
At break even point there is no profit or loss.
So,
R(x) - C(x) = 0
9x - (4.50x + 60) = 0
9x - 4.50x - 60 = 0
4.50x = 60
x = 60 / 4.50
x = 13.3333333
x = 14 units (rounded up because units can't be in points)
So, Joanne must produce and sell 14 T-shirts in order to break even
c)
Profit i.e P(x) = 600
P(x) = R(x) - C(x)
So,
600 = 9x - (4.50x + 60)
600 = 9x - 4.50x - 60
600 + 60 = 4.50x
660 = 4.50x
x = 660 / 4.50
x = 146.6666
x = 147 units (rounded up because units can't be in points)
So, Joanne must produce and sell 147 T-shirts to make a profit of $600.
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