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MathsGuided practice
Maths
Which phone plan is cheaper?
Maths · Guided practice
COMPARE TWO PLANS
Two monthly phone plans charge for calls. Plan A costs €6 per month plus €0.10 per minute. Plan B costs €12 per month plus €0.05 per minute. There are no other charges. Let x be the number of minutes of calls in a month.
Monthly charges
| Plan | Fixed fee | Per minute |
|---|---|---|
| A | €6 | €0.10 |
| B | €12 | €0.05 |
1
For 60 minutes of calls, which plan is cheaper? Calculate the cost of each.
calculate
2
Write the cost of each plan in terms of x. At how many minutes do the plans cost the same?
build an equation
3
Lina makes between 150 and 200 minutes of calls each month. Which plan would you recommend? Use the break-even point to justify your choice throughout that range.
choose and justify
Which phone plan is cheaper?