Answer:
A. 0.9x + 0.3y ≤ 10,000
Step-by-step explanation:
Given
oil based plant
water based plant
The data can be represented in tabular form as:

Considering only A, we have the following constraints:


Since the company currently has 10000 of A.
The above constraint implies that, the mixture cannot exceed 10000.
So, we have:

Hence, (A) is correct