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Answer questions in math sophomore year.
Guo Dunrong replied:

This is a simple mathematical programming problem.

(1) If the maximum number of employees engaged in the tertiary industry is X, then

20 (2000-x) (1+2x/1000) ≥ 2000 * 20 (ten thousand yuan),

Simplify it, 2x? ≤3000 x,

x≤ 1500,

The maximum number of employees in the tertiary industry is 1500.

(2)20(2000-x)( 1+2x/ 1000)≥20x(a-x/ 100),x= 1500,

2000≥ 1500a-22500,a≤49/3,

Maxa=49/3 .