A trader sells two bullocks for Rs. 8,400 each, neither losing nor gaining in total. If he sold one of the bullocks at a gain of 20%, the other is sold at a loss of

S.P. of two bullock = 8400 + 8400

= 16800 Rs.

CP of first bullock = $frac{{100}}{{120}} imes 8400 = 7000$

CP of second bullock =16800 – 7000=9800

Required % loss = $= frac{{9800 - 8400}}{{9800}} imes 100$

$= frac{{1400}}{{9800}} imes 100$

$= frac{7}{{49}} imes 100 Rightarrow = frac{{100}}{7} = 14frac{2}{7}{ m{\% }}$

53. Two trains, A and B, start from stations X and Y towards each other, they take 4 hours