Average Practice Test 3

Total price of 14 pens = Rs (14 × 14) = Rs 196
Total price of 12 pens = Rs (13 × 12) = Rs 156
Price of 2 pens = Rs 40
Let the price of one pen $=\mathrm{Rs}.\left(\mathit{x}+\frac{50}{100}\mathrm{of}\mathit{x}\right)$ $=\mathrm{Rs}\left(\frac{3\mathit{x}}{2}\right)$
So, $\mathit{x}+\frac{3\mathit{x}}{2}=40$
$5\mathit{x}=40\times 2$
$\mathit{x}=16$
∴ The price of 2 pens = Rs 16, 24