A man borrowed Rs. 800 at 10% per annum simple interest and immediately lent the whole sum at 10% per annum compound interest. What does he gain at the end of 2 years ?	Choose the correct choice from the following choices.
A) Rs. 6
B) Rs. 8
C) Rs. 10
D) Rs. 12
E) Rs. 14
S.I FOR RS.800 FR 2 YEARS IS RS.160, WHEREAS AMOUNT IS 168 RS. HENCE GAIN IS 168-160= 
<gadget id="calculator">168-160</gadget>
<output>8</output>
8   ANSWER:Rs. 8
<result>B</result>
A man borrowed Rs. 800 at 10% per annum simple interest and immediately lent the whole sum at 10% per annum compound interest. What does he gain at the end of 2 years ?