what is rate of interest if principal.amount be 400,simple interest 160 and time 2year.	Select the correct option:
A) 10  B) 12.5  C) 20  D) 12  E) 14.5
s.i=(p*r*t)/100   160=800r/100   r=160/8= 
<gadget id="calculator">160/8</gadget>
<output>20</output>
20%   answer 20
<result>C</result>
what is rate of interest if principal.amount be 400,simple interest 160 and time 2year.