Question 343928
t=500+80h
t=750+70h, using the top equation replace t with 750+70h to get:
750+70h=500+80h
-500   -500
250+70h=80h
  -70h  -70
250=10h
10  10
h=25

Since B has a lower price at h = 40, a higher price at h = 20, and an equal price at h = 25, we can say that B has a lower price whenever h > 25.