A restaurant, famous for their eggrolls, has a pricing system that depends on the number of eggrolls that customers order. There's a "per customer fee" that everyone pays and a cost per eggroll that is added to the bill of those who order eggrolls.

Sophie determined that the function describing the cost of dinner is linear: if you order $\displaystyle{x}\usepackage{cmbright}\Huge\$ eggrolls, your dinner will cost $\displaystyle{1.50}{x}+{10}\usepackage{cmbright}\Huge\$ dollars. What is the "per customer fee"?