Question

Mariel wanted to avail a cellphone plan that offers a

monthly fee of ₱2,500.00. Itincludes 240 minutes of call and charges ₱7.50 for each additional minute of usage.

Answer 1

According to the passage, let x be the monthly call time

So the monthly cost function will be

$C(x)=2500+(x-240)*7.5\\ C(x)=700+7.5x$