TIRE EXPENSE PER TRAILER PER WEEK (OO)(Trailer Tire Expense OO+Outside Vendor Repair Trailer Tires OO+Outside Vendor Reefer Tire Expense OO)(Weeks In Month CF)\frac{(Trailer\ Tire\ Expense\ OO+Outside\ Vendor\ Repair\ Trailer\ Tires\ OO+Outside\ Vendor\ Reefer\ Tire\ Expense\ OO)}{(Weeks\ In\ Month\ CF)}(Weeks In Month CF)(Trailer Tire Expense OO+Outside Vendor Repair Trailer Tires OO+Outside Vendor Reefer Tire Expense OO)