SOLUTION: company A charges a rate of $20 per month plus $0.05 per minute. company B charges a rate of $10 per month plus $0.10 per minute. what is the number of minutes used above which c

Question 487041: company A charges a rate of $20 per month plus $0.05 per minute.
company B charges a rate of $10 per month plus $0.10 per minute.
what is the number of minutes used above which company A cost more than company B.
Answer by John10(297) (Show Source): You can put this solution on YOUR website!
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:)
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