717 (2) The Special Officer shall first determine in respect of each village (hereinafter in this section referred to as "Principal village") in an estate : (a) the average rate of cash rent per acre prevailing at the commencement of this Act for each class of ryoti land which was in existence in the principal village at such commencement, such as wet, dry and garden; Provided that where no cash rents are prevalent in the principal village in respect of any class of land the Special Officer shalt determine the average rate of cash rent per acre prevailing at such commencement for such class of land in the nearest village in the estate in which cash rents are prevalent for such class of land and in which conditions are generally similar to those obtaining in the principal village, or where there is no such village in the estate, in the nearest village in the nearest estate in respect of which village both the requirements specified above are satisfied; (b) the average rate of assessment per acre prevailing at such commencement in respect of each of the s classes of land in the nearest ryotwari area in which conditions are generally similar to those obtaining in the principal village.