Question

For his phone service, Felipe pays a monthly fee of $20, and he pays an additional $0.04 per minute of use. The least he has been charged in amonth is $78.04.What are the possible numbers of minutes he has used his phone in a month?Use m for the number of minutes, and solve your inequality for m.

Answer 1

Suppose, m be the number of minutes felipw used.

For his phone service, Felipe pays a monthly fee of $20, and he pays an additional $0.04 per minute of use.

Therefore, the total amount paid by him in a month is

$0.04m+20$

The least he has been charged in a month is $78.04.

Therefore,

$\begin{gathered} 0.04m+20\ge78.04 \\ 0.04m\ge78.04-20 \\ 0.04m\ge58.04 \\ m\ge1451 \end{gathered}$

So, the possible number of minutes he has used in a month is 1451 minutes or more than 1451 minutes.