You need to buy 6 binders for work. You have two options
Option 1: $3.25 per binder and a rebate offering $1.50 off
the total
Option 2: $3.00 per binder and a coupon offering $0.25
off each binder
You find a third company that offers binders at $1.00 less
than the total cost of the better deal between Option 1
and Option 2