A vendor buys chikoos at 15 for 8 and then sells at 10 for 6. What will be the result?

C.P. of 1 Chikoo $=$ Re. $frac{8}{15}$ S.P. of 1 Chikoo $=frac{6}{10}$ $=operatorname{Re} cdot frac{3}{5}=operatorname{Re} cdot frac{9}{15}$ $herefore$ Profit $=$ Re. $left(frac{9}{15}-frac{8}{15} ight)$ $=operatorname{Re} cdot frac{1}{15}$ $herefore$ Profit per cent $=frac{frac{1}{15}}{frac{8}{15}} imes 100$ $=frac{100}{8}=12.5 \%$ Alternative:

= 10 gain

(Chikoos are equal I × 10 and II × 15)

Gain per cent $=frac{ ext { S.P.-C.P. }}{ ext { C.P. }} imes 100$

$=frac{90-80}{80} imes 100=12.5 \%$