Calculating prices using checkboxes?

Calculating prices using checkboxes?

Hi 

Im pretty new to this application and Im trying to set up a BMX database for our company. Im just working it out little by little by Im trying to figure out if you can use it to calculate prices for the different types of riders that we get and if they hire equipment using checkboxes. For example if someone checks that the rider has hired a bike and is a member it automatically brings up the price the rider needs to be charged. However if another rider comes and hires a bike but isnt a member, a different price will be calculated. Im just trying to make it as idiot proof as possible for our multiple members of staff.