What is the change in the objective function value if Metal is increased to $400$ and, simultaneously, Plastic is changed to $80?$

Variable Cells

Final

Reduced

Objective

Allowable

Allowable

Variable

Value

Cost

Coefficient

Increase

Decrease

X

$250$

$0$

$15$

$30$

$25$

Y

$300$

$0$

$30$

$45$

$50$

Constraints

Final

Shadow

Constraint

Allowable

Allowable

Name

Value

Price

R$.$H$.$ Side

Increase

Decrease

Metal

$360$

$8$

$360$

$80$

$20$

Water

$120$

$0$

$150$

$40$

$15$

Plastic

$100$

$2$

$100$

$150$

$50$

Group of answer choices

$$360$

$$320$

$$280$

$$240$

Must recalculate. Change violated the $100\%$ rule.