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Mathematics prize junior high school
(1) According to the meaning of the question, the first, second and third prizes can be set as compasses, notebooks and ballpoint pens.

At this time, the cost is 4×4+6×3+20×2=74 yuan.

(2) If the unit price of the third prize is X yuan, the unit price of the second prize should be 2x yuan.

The unit price of the first prize is 4x yuan, which means 4X+6X+20X ≤ 200.

The solution is x≤4 16 (element).

So X can be selected from 4 yuan, 3 yuan and 2 yuan.

So 4x should be 16 yuan, 12 yuan, 8 yuan,

Then 2x should be: 8 yuan, 6 yuan, 4 yuan.

Looking at the unit prices of various prizes provided in the table, we can see that 16 yuan, 8 yuan, 4 yuan, 8 yuan, 4 yuan and 2 yuan are suitable for the title.

Therefore, there are two purchase schemes: Scheme 1: The unit price of prizes is 16 yuan, 8 yuan and 4 yuan in turn, and the required expenses are 192 yuan;

Scheme 2: The unit price of prizes is 8 yuan, 4 yuan and 2 yuan, and the required expenses are 96 yuan.

Thus, the most expensive scheme needs 192 yuan.

A: The most expensive plan is 192 yuan.