Question

A phone company offers two monthly charge plans. In Plan A, the customer pays a monthly fee of $13 and then an additional 4 cents per minute of use. In Plan B, there is no monthly fee, but the customer pays 6 cents per minute of use.

For what amounts of monthly phone use will Plan A cost more than Plan B?
Use m for the number of minutes of phone use in a month, and solve your inequality for m

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Answer 1

☆ for plan-A.. fixed cost : $13 variable cost : $ let s = number of total cost is, II nute. minutes so, ly, = 0.4x+13 | ☆ plan - Bi. variable so, total cost: $0.6 l minutes cost Yz is, M = 0.68]

«ке ч, = 3, 0.4% +13= 0.6x 0.63-0.44=13 0.2x=13 d = 13 2 10=65 when number of minutes is less than the 6s minutes then cost of plan A will be more than the plan B and it number of minutes is greater than the 65 minutes then cost of plan B will be more than the plan A