Answer:
Cost to increase production is $733.6
Explanation:
We have given marginal cost [tex]MC=0.002q^2-0.8q+635[/tex]
Fixed cost = $8400
So total cost [tex]TC=0.002q^2-0.8q+635+8400[/tex]
Cost of 310 items
[tex]TC=0.002\times 310^2-0.8\times 310+635+8400=8979.2[/tex]
Cost of 530 items
[tex]TC=0.002\times 530^2-0.8\times 530+635+8400=9712.8[/tex]
So the cost increases production is $9712.8 - $8979.2 = $733.6