Question 903921
y=mx+b
m=1.30-.45=85  for profit 
m=1.30 revenue
m=.45 cost

y=21000
x=18000



.85*x =21000 breakeven 24706 yards MONTHly! multiply by 12 for YEARly
y=.45*18000 +21000 for total cost 29100 for 18000
y=1.30*18000 total revenue = money received 23400
y=23400-29100=-5700 loss NOT profit for the 18000 yards