An online fax company, EFaxIt. com, has a customer plan where a subscriber pays a monthly subscription fee of $11.25 dollars and can send/receive 70 fax pages at no additional cost. For each page sent or received past the 70 page limit, the customer must pay an overage fee of $0.07 per page. The following expression gives the total cost, in dollars, to send P, pages beyond the plan's monthly limit.
C=0.07p+11.25
If the monthly bill under this plan comes out to be $17.97, what was the total number of pages that were sent or received?