the banker's discount on a bill due 4 months hence at 15% is Rs.420. what is the true discount?  Choose the correct choice.
A) 41  B) 400  C) 390  D) 380  E) 480
TD= (400D * 100)/(100+TR)= (420 * 100)/100+((4/12)*15)= (420 * 100)/100+((1/3)*15)   =(420 * 100)/100+5= (84 * 100)/21 = 4*100= 
<gadget id="calculator">4*100</gadget>
<output>400</output>
400   correct answer: (400)
<result>B</result>
the banker's discount on a bill due 4 months hence at 15% is Rs.420. what is the true discount?