A bank offers 5% compound interest per half year. A customer deposits Rs 4800 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest?

The interest earned on 4800 from Jan to July will be $$4800 \times 5 \times \frac{1}{100}$$ (Since rate of interest is 5 % per 6 months)

= $$48 \times 5 = 240$$

Hence, 4800 will amount to 5040. He adds another 4800 to this. So the net amount becomes 5040 + 4800 = 9,840.

Now interest earned on this amount in a period of 6 months will be $$9840 \times 5 \times \frac{1}{100} = 492$$

So the final amount will be 9840 + 492 = 10332

Total money he deposited = 4800 + 4800 = 9600

Hence, amount earned via interest = 10332 - 9600 = 732

=> Ans - (A)