Homework Answers
Cost formula C = 20 + 0.2(x-60)
Given bill cannot be greater than $60
C ≤ 60
20 + 0.2(x-60) ≤ 60
0.2(x-60) ≤ 60-20
0.2(x-60) ≤ 40
(x-60) ≤ 40/0.2
x-60 ≤ 200
x ≤ 200+60
x ≤ 260
Therefore Maximum 260 minutes can be used.
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