Phan chose an Internet service that charges $18.00 per month plus $0.024 per minute. Deion chose an Internet service that charges $30.00 per month for unlimited usage. At the end of the month, Phan’s and Deion’s charges were identical. For how many minutes did Phan use the Internet service that month?
- A50
- B60
- C100
- D500
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Correct answer: D
Let x be the number of minutes Phan used his internet service in the month. Phan’s monthly charges were
18 + 0.024x
Since Deion’s charges were the same as Phan’s, set the expression equal to 30 and solve for x:
18 + 0.024x = 30
0.024x = 12
x = 500
Phan used his service for 500 minutes.