Madhya Pradesh Police Exam Model Paper 4

Given:
Number of articles brought = 6
Cost price of 6 articles = Rs. 8
Number of articles sold = 10
Selling price of 10 articles = Rs. 12
Concept:
First, equal the number of articles sold and brought so that the cost price of the number of articles sold can be determined. Then calculate the profit or loss percentage.
Formula used:
Loss % $=\left[\left(\mathit{C}\mathit{P}-\mathit{S}\mathit{P}\right)/\mathit{C}\mathit{P}\right]\times 100$
Calculation:
Taking LCM of the number of articles sold and brought;
We get 30.
∴ CP of 30 articles $=8\times 5=\mathit{R}\mathit{s}40$
SP of 30 articles $=12\times 3=\mathit{R}\mathit{s}.36$
∴ Loss % $=\left[\left(40-36\right)/40\right]\times 100$
$\Rightarrow \left(4/40\right)\times 100$
$\Rightarrow 100/10$
⇒ 10%
∴ His percentage of loss is 10%