Question 60402
The minimum will be on the Line of Symmetry at the Turning Point.
The LOS can be found using LOS =-b/2a with a being the x^2 coefficient and b being the x coefficient
For the equation C(x) = 0.02x^2 – 3.4x + 150
the LOS = 3.4/(2*0.02)
= 3.4/0.04
= 85
Substitute x = 85 into the Cost equation to find the cost of producing that many bars

{{{C=0.02*85^2-3.4*85+150}}}
{{{C=144.5-289+150}}}
{{{C=5.50}}} 
The cost per item is found by dividing the cost by the number of items
{{{Cost per item =5.50/85}}} = $0.064