1y =( 15+3)×x+(20+4)(2000-x)
(cost per tree × number of trees+cost per tree × number of trees)
= 18x+48000-24x
=-6x+48000
(0 & ltx & lt200)
2 From the meaning of the question:
0.95x+0.99×(2000-x)= 1960
-0.04x= 1960- 1980
x=500
So y =-6× 500+48000.
=45000
A: The total cost is 45,000 yuan.