A shopkeeper earns 10% on an investment but loses 20% on another investment. If the ratio of the two investments is 2 : 3, then the combined loss percentage is:

Solution (By Examveda Team)

Investments = 200 : 300
\[\begin{array}{*{20}{c}} {200}&:&{300} \\ {\,\,\,\,\,\,\,\,\,\, \downarrow + 10\% }&{}&{\,\,\,\,\,\,\,\,\,\, \downarrow - 20\% } \\ {220}&{}&{240} \end{array}\]
Investments = 500
After increase/decrease = 460
Loss = 40
Loss % = $$\frac{{40}}{{500}}$$ × 100 = 8%