By the said indenture, the head lessees inter alia undertook to pay to the Raja during the first 15 years of the said period of 40 years of the lease i.e., from the 1st day of August, 1927, to 31st day of July, 1942, royalty at the rate of annas /10/ (ten) 62 paise for every 100 cubic feet i.e., roughly at 15 1/2 paise per ton of solid lime stone, quarried, raised, got, used or taken out from the demised premises and for the remaining 25 years of the lease i.e. from the 1st day of August, 1942, to 31st day of July, 1967, royalty at the rate of annas /15/ (fifteen) 94 paise instead of annas /10/ (ten) for every 100 cubic feet i.e. roughly at 24 paise per ton of solid lime stone, quarried, raised, got, used or taken out from the demised premises.