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 .
? I only had one head teacher in senior high school for three years, and that was my math teacher, Miss Liang. Teacher Liang is a clever and capable teacher, and