Concept explainers
How many GB were used in January?
Answer to Problem 51PFA
Explanation of Solution
Given:
A cell phone company charges $4 per GB beyond 20 GB in a month. The monthly plan is $59.99, and the bill for January is $75.99.
Concept Used:
As per the plan the cost for 20GB per month is $59.99. Extra charge per GB is $4.
Total bill for January is $75.99. From this information it is clear that definitely used extra GB in January.
Calculation:
Let the extra GB used = x. As per plan total cost per month is $59.99. Total bill for January is $75.99.
Equation:
Total GB were used in January:
Thus,
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