RRB Non Technical Model Papers 9 with solutions

(2) He bought 50 pens in ₹50.
So he paid ₹1 for 1 pen
∴ C.P. of 40 pens =₹ 40,
Loss% = 5%
∴S.P. of 40 pens = 95% of 40
$=95\times \frac{40}{100}=\mathit{₹}38$
He wants to earn 10% profit overall
∴Whole S.P. = 110% of 50
$=110\times \frac{50}{100}=\mathit{₹}55$
∴S.P. of rest 10 pens
$=\mathit{₹}\left(55\mathit{–}38\right)=\mathit{₹}17$
∴λ S.P. of 1 pen should be
$=\mathit{₹}\frac{17}{10}=\mathit{₹}1.7$
∴profit = 1.7 – 1 =₹ 0.7

$=\frac{0.7\times 100}{1}\%=70\%$