A fruit vendor buys 10 bananas for Rs. 14 and sells them at 12 for Rs. 15. Find his percentage gain or loss.

The correct option is A $10\frac{5}{7}\%loss$


% gain or loss $=(\frac{xw}{zy}-1)\times 100\%$
$=(\frac{10\times 15}{12\times 14}-1)\times 100\%=(\frac{150}{168}-1)\times 100\%=-\frac{18}{168}\times 100\%=-10\frac{5}{7}\%$
Since the sign is -ve, since there is a loss of $10\frac{5}{7}\%$