Of course this rate of exchange would apply to both the parties, Farasol and the O.N.G.C. ' 'As stated earlier this has been worked out only upto 30.6.1974 and in accordance with the directions contained in this award interest shall be calculated on the principal amount right upto 21.12.1974 on the entire amount of principal and the entire sum of principal and interest would thereafter carry interest at 6% per annum, as stated in the other portion of the award." (The emphasis has been supplied by us.) Article XI 1.1 of the said contract referred to in the said Erratum provided as follow: "XI 1.1.1 On the basis of the figures arrived at in Articles IX 2.1 and IX 2.2 above and in accordance with the condition laid down in Article IX 3.1 above, the total 547 of FORASOL 's operational and standby fees, equipment charges and transportation charges payable in Indian Rupees under this contract, is estimated to be FF 1,495, 216, Following signature of this contract, ONGC shall pay to FORASOL, as an advance, 10a/c of this amount i.e. FF 149,522 in Indian Rupees using a conversion rate of FF 1.033 = Rs. 1.000.