Consider the following cost$$ function:

Upper C equals $0\mathrm{.}2$ q cubed minus $4$ q squared plus $80$ q plus $150.$

Part $2$

When output is $15$units$,$ average costLOADING$...$ is $$$

$$

$75.($Enter a numeric response using a real number rounded to two decimal$$ places.$)$

Part $3$

When output is $15$units$,$ marginal costLOADING$...$ is $$$

$$

enter your response here.