Calculation algorithm

Tm – total area of plates without remnant on the last plate
T – total area of plates without remnant on the last plate and without margins
W – total area of lites 
O – area of usable waste (inc. remnant on the last plate)
R – area of remnant on the last plate
Sm – waste rate with glass margins
S – waste rate without margins
Su – waste rate complied with usable waste

Sm = (Tm –W)/ Tm
S = (T-W)/T
Su = (Tm-W-(O-R))/Tm
Su = (Tm-W-(O-R))/(Tm-(O-R))