Provided further that, (i) the amount of the rebate under clause (i) or clause (ii) shall be reduced by the sum, if any, equal to the amount or the aggregate of the amounts, as the case may be, computed as hereunder: . . . . . (c) in addition, in the case of a company referred to in clause (ii) of the preceding proviso which has distributed to its shareholders during the previous year dividends in excess of six per cent of its paid up capital, not being dividends payable at a fixed rate 83 (A) in the case of a company which is not such as is referred to in sub section (9) of section 23A of the Income tax Act : on that part of the said dividends which exceeds 6 per cent, but does not exceed 10 per cent of the paid up capital; at the rate of 10% on that part of the said dividends which exceeds 10 per cent of the paid up capital; at the rate of 20% Explanation.