20% of the Gross Turnover for each Accounting Year except that, if for any Accounting Year the Hotel occupancy rate (as certified by the Landlord) shall be less than 75% and more than 50%, the Specified Percentage shall be calculated pro rata on the amount of the Gross Turnover on a sliding scale (for the sake of example occupancy room rate of 62.5% will produce a Specified Percentage of 10%) for that Accounting Year and if for any Accounting Year the Hotel occupancy rate (certified as aforesaid) is less than 50% the Specified Percentage shall be 0%;