what is rate of interest if principal.amount be 400,simple interest 120 and time 2year. Choose the correct choice from the following options:
A) 10
B) 12.5
C) 25
D) 12
E) 15
s.i=(p*r*t)/100   120=800r/100   r=120/8= 
<gadget id="calculator">120/8</gadget>
<output>15</output>
15%   answer 15
<result>E</result>
what is rate of interest if principal.amount be 400,simple interest 120 and time 2year.