11. Payment of interest.- In any decree passed in a suit for foreclosure, sale or redemption, where interest is legally recoverable, the court may Order payment of interest to the mortgagee as follows, namely:— (a) interest up to the date on or before which payment of the amount found or declared due is under the preliminary decree to be made by the mortgagor or other person redeeming the mortgage— (I) on the principal amount found or declared due on the mortgage—at the rate payable on the principal, or, where no such rate is fixed, at such rate as the court deems reasonable, [* * *] and (iii) on the amount adjudged due to the mortgagee for costs, charges and expenses properly incurred by the mortgagee in respect of the mortgage security up to the date of the preliminary decree and added to the mortgage money,—at the rate agreed between the parties, or, failing such rate, at such rate not exceeding six per cent per annum as the court deems reasonable; and
(b) subsequent interest up to the date of realisation or actual payment on the aggregate of the principal sums specified in clause (a) as calculated in accordance with that clause at such rate as the court deems reasonable.
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