Var% is a variance of your offered rates and normal rates.
nrml Tariff = Rates which we have configured or update = normal tariff
ofrd Tariff = Rate on which we give the bookings, manual rates for booking = offered tariff
Formula for Var %:
if normal rate is 0 then var % = offered tariff * -100
otherwise var % = ((normal tariff – offered tariff) * 100 / normal tariff) * -1