Question

How do I solve this question (72)?

This is an inequality word problem, I assume.

Answer 1

See below.

Explanation:

Calling

`c_A = 800` storage cost for item `A`
`c_B = 1200` storage cost for item `B`

we have the restrictions

`n_A ge 2n_B` ...the store stocks at least twice as many units of model `A` as units of model `B`.

Here `n_A` and `n_B` are respectively number of items for `A` and `B`

`c_a*n_a+c_B*n_B le 20000`

`n_A ge 4`
`n_B ge 2`

Attached a plot with the feasible region in light blue.