Section 152(c) in Greater Hyderabad Municipal Corporation Act, 1955
(c)the Corporation shall either pay off the money so borrowed, within the period sanctioned, by equal annual instalments of principal or of principal and interest, or in such other manner as may be approved by the Government, or they shall in every year set apart as a sinking fund and accumulate in the way of compound interest, by investing the same in the purchase of public securities, such sum as will, with accumulations in the way of compound interest, be sufficient, after payment of all expenses, to pay off the moneys so borrowed within the period sanctioned or within such other period as may be approved by the Government;