The average weight of a head of lettuce (with the outer leaves and stem left on) is 26 ounces. When you trim off the waste, it now weighs 20 ounces.
NOTE: Remember to weigh produce BEFORE it is washed as water weighs a lot!
Use the calculation: 20 ounces divided
by 26 ounces = .77 OR 77%. 100% - 77% = 23% waste. The entry in the
Item Yield Factor field would be 77%.