Mr Duggal invested Rs 20000 with rate of interest @ 20 p.c.p.a. The interest was compounded half-yearly for first one year and in the next year it was compounded yearly. What will be the total interest earned at the end of 2 years? (a) Rs 8040        (b) Rs 8800        (c) Rs 9040 (d) Rs 9800     (e) None of these