Question

Lee really wants a cell phone but wonders if it is too expensive. He decides to get

the cheapest plan that costs $27.50 per month. He has 150 minutes free. Additional
minutes are 35¢ each. He ends up using the phone way more than he expected. He
ends up using 400 minutes in total. How much extra does Lee have to pay?

Answer 1

$87.50

Explanation:

first minus the number of minutes he doesn't have to pay

400 - 150 = 250

then times the number of leftover minutes by how much it costs a minute ($.35 because 35¢ is equal to $.35)

250 × $.35 = $87.50

that's how much.

Answer 2

Answer:The extra amount that he paid is $87.5

Explanation:

The plan that Lee got costs $27.50 per month. He has 150 minutes free. Additional minutes are 35¢ each. Converting 35¢ to dollars, it becomes 35/100 = $0.35

Let x represent the total number of minutes that Lee used. Let y represent the total cost of using x minutes. Therefore,

y = 27.50 + 0.3535(x - 150)

He ends up using the phone way more than he expected. He

ends up using 400 minutes in total. The total cost of using 400 minutes will be

y = 27.50 + 0.35(400 - 150) = 27.50 + 87.5 = $115

The extra amount that he paid is

0.35(400 - 150) = $87.5