Suppose you buy X computers and Y desks (x》=35, y》=600).

0.9 * 6000 x+0.8 * 150y & lt； =270000

Then draw a picture (my computer is not good at drawing, so I will do it on the draft here)

D: Scheme 1: x=35, y=675.

Scheme 2: x=36, y=630.

I hope these two schemes can help you.