A person borrows Rs. 4000 for 2 years at 4% p.a. simple interest. He immediately lends it to another person at 6 p.a for 2 years. Find his gain in the transaction per year.  Pick one:
A) 100 rs
B) 80 rs
C) 160 rs
D) 180 rs
E) 200 rs
Gain in 2 years =   [(4000*6*2)/100]-[(4000*4*2)/100]    480-320= 
<gadget id="calculator"> 480-320</gadget>
<output>160</output>
160   Gain in 1 year=(160/2)= 
<gadget id="calculator">(160/2)</gadget>
<output>80</output>
80 rs   ANSWER:80 rs
<result>B</result>
A person borrows Rs. 4000 for 2 years at 4% p.a. simple interest. He immediately lends it to another person at 6 p.a for 2 years. Find his gain in the transaction per year.