If A lends Rs.3500 to B at 10% per annum and B lends the same sum to C at 12% per annum then the gain of B in a period of 3 years is?  Choose the correct choice from the following answers.
A) 200 B) 210 C) 220 D) 225 E) 230
(3500*2*3)/100= 
<gadget id="calculator">(3500*2*3)/100</gadget>
<output>210</output>
&gt; 210   Answer: 210
<result>B</result>
If A lends Rs.3500 to B at 10% per annum and B lends the same sum to C at 12% per annum then the gain of B in a period of 3 years is?