What is the rate percent when the simple interest on Rs.4000 amount to Rs.320 in 2 Years?	Choose the correct option:
A) 4% B) 4.1% C) 4.2% D) 4.3% E) 4.5%
Interest for 1 year = 320/2= 
<gadget id="calculator">320/2</gadget>
<output>160</output>
160   Interest on Rs 4000 p/a= 160   interest rate = 160/4000*100= 
<gadget id="calculator">160/4000*100</gadget>
<output>4</output>
4%   4%nswer : 4%
<result>A</result>
What is the rate percent when the simple interest on Rs.4000 amount to Rs.320 in 2 Years?