pricing of frequently traded shares in preferential issue

the provisions include determining the price of shares on the basis of 90 trading days, but as above mentioned it is pricing of frequently traded shares[ which by definition are defined as those that traded for "240 trading" on any recognised stock exchange amounting to at least 10% of total shares]. If equity shares of issuer are listed for a period of 90 trading days- 239 trading days , how can it be determined as frequently traded shares?