What is the surface area of this rectangular prism ?

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?

Answer! if you don’t mind, can you explain