( 1 ) THIS batch of 35 appeals are against the common judgment of the learned Single Judge (B. N. Kirpal, J.) whereby he allowed the petitions and quashed the demand raised by the Delhi Development Autority (D. D. A.) in excess of increase cost of land at the rate of Rs. 9 50 000. 00 per acre calculated on the basis of "no profit no loss".

( 2 ) ALL these appeals raise same questions of law and can again be disposed of by a common judgment.

( 3 ) THE facts are not in dispute. The petitioners in the writ petitions are now first respondents in all these appeals and are societies registered under the Societies Registration Act, 1860. They run schools. They were allotted land by the D. D. A. at various placed in Delhi for the construction of school buildings. For the purpose of decision of these appeals, it is not necessary to give the details of the land allotted to these societies. These societies were allotted land between the period 1. 4. 1987 to 3. 10. 1988. The allotment letter stipulated that the land was being allotted "for school building at the provisional rate of Rs. 8,00,000. 00 per acre and annual ground rent at the rate of 21^) per annum of the premium" and f