The marked price of a radio is Rs 1,600. Rahul gives successive discount of 10%, r% to the Pradeep. If Pradeep pays Rs 1.224 for the radio, find the value of r.	Select the correct option:	A) 10%	B) 20%	C) 25%	D) 15%	E) 30%
Marked price of the article = Rs 1,600   Therefore, Selling price = (100 - 10)% x (100 - r%) x 1600   = (90/100) x [(100 - r) / 100] x 1600   Given, 1224 = 9/10 x (100 - r) x 16   =&gt; 1224 x 10 / (9 x 16) = (100 – r)   85 = 100 - r   r = 15%   ANSWER:15%
<result>D</result>
The marked price of a radio is Rs 1,600. Rahul gives successive discount of 10%, r% to the Pradeep. If Pradeep pays Rs 1.224 for the radio, find the value of r.