what is rate of interest if principal.amount be 400,simple interest 100 and time 2year. Choose the correct choice: A) 10 B) 12.5 C) 25 D) 12 E) 14.5
s.i=(p*r*t)/100   100=800r/100   r=100/8= 
<gadget id="calculator">100/8</gadget>
<output>25/2 = around 12.5</output>
12.5%   answer 12.5
<result>B</result>
what is rate of interest if principal.amount be 400,simple interest 100 and time 2year.