A village bank offers 5% compound interest calculated on half-yearly basis. A regular customer deposits Rs. 1600 each on 1st January and 1st July of a year. At the end of the year, the amount the customer would have gained by the way of interest is:	Choose the most appropriate option.
A) 121  B) 130  C) 125  D) 135  E) 140
after 1 yr Rs 1600 at 5% at half yearly   P(1+(R/2)/100)^2T = 1600(1+(5/2)/100)^2*1 = 1600(1+1/40)^2--1   amt after 1/2 yr on Rs 1600 at 5%   ==&gt; 1600(1+(5/2)/100)^2*1/2 = 1600(1+1/40)--2   total amt after 1 yr from 1 and 2   1600(41/40)(81/40) = 41* 81= 
<gadget id="calculator">41* 81</gadget>
<output>3_321</output>
3321   Comp int= 3321- 3200= 
<gadget id="calculator">3321- 3200</gadget>
<output>121</output>
Rs 121   121NSWER 121
<result>A</result>
A village bank offers 5% compound interest calculated on half-yearly basis. A regular customer deposits Rs. 1600 each on 1st January and 1st July of a year. At the end of the year, the amount the customer would have gained by the way of interest is: