Question

Molly pays $17.25 per month for her phone service and spends anaverage of $6.50 per month for long-distance calls. How much does herphone service cost her in all each year?a. $570b. $23.75c. $285d. $129

Answer 1

Notice that both the monthly payment and the long distance calls are constant each month, then, each month Molly has to pay17.25+6.50=23.75. Then, for a year we have :

$23.75\cdot12=285$

therefore, the cost for phone service in a year is $285