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Posted by **Sonji** on Sunday, January 15, 2012 at 11:30am.

• Plan A: $45 a month for unlimited calling Plan B $15 a month .10 per min.

I need to write a cost equation for plan A and for plan B then I need to solve.

- math -
**Reiny**, Sunday, January 15, 2012 at 11:36amPlan A: cost = 45

Plan B: cost = .10x + 15, where x is the number of minutes

You want to know when

.10x + 15 > 45

x + 150 > 450

x > 300

check:

for 299 minutes:

PlanA = 45

PlanB = 29.90 + 15 = 44.90

...... Plan B is still better

for 301 minutes:

Plan a = 45

PlanB = 30.10 + 15 = 45.10

.... Plan A is better for x > 300

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