Question 487041
Company A: C = 0.05x + 20
Company B: C = 0.10x + 10
If the company B cost is less than the company A:
0.1x + 10 < 0.05x + 20
0.1x - 0.05x < 20 -10
0.05x < 10
 x < 10/0.05
x < 200
So at 200 minutes, company A cost more than company B.
John10:)