199. Such sums as may be prescribed by Act of the Federal Parliament shall be charged on the revenues of the Federation in each year as grants-in-aid of the revenues of such units as the Parliament may determine to in need of assistance, and different sums may be prescribed for different units:

Provided that there shall be paid out of the revenues of the Federation as grants-in-aid of the revenues of a Province such capital and recurring sums as may be necessary to enable that Province to meet the costs of such schemes of development as may be undertaken by the Province with the approval of the Federal Government for the purpose of promoting the welfare of the Scheduled Tribes in the Province or raising the level of administration of the scheduled areas in the Province to that of the administration of the rest of the Province:

Provided further that there shall be paid out of the revenues of the Federation as grants-in-aid of the revenues of the Province of Assam sums, capital and recurring, equivalent to–

(a) the average excess of expenditure over the revenues during the three years immediately preceding the date of commencement of this Constitution in respect of the administration of the areas specified in Part I of the table appended to paragraph 19 of the Eighth Schedule to this Constitution; and

(b) the costs of such schemes of development as may be undertaken by that Province with the approval of the Federal Government for the purpose of raising the level of administration of the said areas to that of the administration of the rest of the Province.