erinn's basic cell phone plan charges $54.99 for service plus $0.18 per minute beyond the included 500 minutes in the plan.
How much will it cost erinn if she used her cell phone for 570 minutes in one month ?

Question

erinn's basic cell phone plan charges $54.99 for service plus $0.18 per minute beyond the included 500 minutes in the plan. 
How much will it cost erinn if she used her cell phone for 570 minutes in one month ?

anonymous · Answer

ok so she uses 570more min then he plan has atm right?

anonymous · Answer

$54.99 + the $102.60(the extra mins at .18) would be $157.59 rounded 
($158)

texaschic101 · Answer

54.99 + 70(.18)
54.99 + 12.60 = 67.59

texaschic101 · Answer

500 minutes came with the plan, so she used 70 minutes more then her plan included. So she had to pay 70(.18) = 12.60 for her extra 70 minutes.