(2)

25≤x≤30 1, w = (40-x) (x-20)-25-100 =-x2+60x-925 =-(x-30) 2-25.

Therefore, when x=30, the maximum value of W is -25, and the minimum loss of the company is 250,000;

2 when 30￠x≤35, w = (25-0.5x) (x-20)-25-100 =-x2+35x-625 =-(x-35) 2-12.5.

Therefore, when x=35, the maximum value of W is-12.5, and the minimum loss of the company is125,000;

Compared with 1 2, in the first year of investment, the company lost money, with the lowest loss of 1.25 million;

(3)

25≤x≤30 1, w = (40-x) (x-20-1)-12.5-10 =-x2+59x-782.5.

Let W=67.5, then -x2+59x-782.5=67.5 is simplified as: x2-59x+850 = 0x1= 25; x2=34，

At this time, when the total profit for two years is not less than 675,000 yuan;

2 when 30% x ≤ 35, w = (25-0.5x) (x-20-1)-12.5-10 =-x2+35.5x-547.5.

Let W=67.5, then -x2+35.5x-547.5=67.5 is simplified as: x2-71x+1230 = 0x1= 30; x2=4 1，

At this time, when the total profit for two years is not less than 675,000 yuan, 30% x≤35；;