In order to protect the environment, an enterprise decided to buy 10 sets of sewage treatment equipment. Existing A, B two types of equipment, which the price of each unit, the monthly amount of sewag

In order to protect the environment, an enterprise decided to buy 10 sets of sewage treatment equipment. Existing A, B two types of equipment, which the price of each unit, the monthly amount of sewage treatment such as Solution: (1) set the purchase of sewage treatment equipment type A x units, then B (10-x) units.

12x + 10 (10-x) ≤ 105, the solution x ≤ 2.5.

∵ x to take a non-negative integer, ∴ x can be taken as 0, 1, 2.

There are three kinds of purchasing program: purchase of A-type 0, B-type 10 units;

A-type 1, B-type 9 units;

A-type 2, B-type 8 units.

(2) 240x + 200 (10 - x) ≥ 2040,

Solve x ≥ 1, so x is 1 or 2.

When x = 1, the purchase of funds for: 12 × 1 + 10 × 9 = 1.02 (million yuan);

When x = 2, the purchase of funds for 12 × 2 + 10 × 8 = 1.04 (million yuan),

So in order to save money, should buy A type 1 units, B type 9 units.

(3) 10 years the total funds of the enterprise's own sewage treatment:

102 + 10 × 10 = 2.02 (million yuan),

If the sewage will be discharged to the sewage plant to treat:

2040 × 12 × 10 × 10 = 2,448,000 (yuan) = 2,448,000 (million yuan).

Saving money: 244.8-202 = 42.8 (yuan).