what is rate of interest if principal.amount be 400,simple interest 180 and time 2year.	Choose the correct choice from the following
A) 10 B) 12.5 C) 25 D) 22.5 E) 14.5
s.i=(p*r*t)/100   180=800r/100   r=180/8= 
<gadget id="calculator">180/8</gadget>
<output>45/2 = around 22.5</output>
22.5%   answer 22.5
<result>D</result>
what is rate of interest if principal.amount be 400,simple interest 180 and time 2year.