Provision for cases in which amount payable to owner exceeds amount due

from him. — If the owner of an original plot is not provided with a plot in the final scheme or if the contribution to be levied from him under section 88 is less than the total amount payable to him under any of the provisions of this Act, the net amount of his loss shall be payable to him by the Planning and Development Authority in cash or in such other manner as may be agreed upon by the parties.