Problema Solution
Cell phone world charges a flat rate for unlimited minutes plus a fee per text message. For the month of January, Tobin sent 280 text messages and his total bill was $43.99. For the month of February Tobin sent 490 text messages and his total bill was $54.49. What is cell phone world charging per text message sent?
Answer provided by our tutors
let a be fixed charge and x per message charge
a+280x=43.99
a+490x=54.49
subtracting we get
210x=10.5
x =0.05
so per text cahrrge is %0.05 or 5 cents per message