Correct Answer: TK 810

Explanation:

Let, the profit made by selling a pencil = x

The profit made by selling a pen =$\frac{3}{2}$
$\frac{3}{2}$
x x =$\frac{3x}{2}$
$\frac{3x}{2}$

Total pen sells in a month = 12 x 30 = 360

and total pencil sells in a month = 16 x 30 = 480

The profit made by selling pencils in a month = (480 x x) = 480x

And the profit made by selling pens in a month = (360 x$\frac{3x}{2}$
$\frac{3x}{2}$
) = 540x480x = 720

x = $\frac{3}{2}$
$\frac{3}{2}$
The profit made by selling pens in a month = (540 x $\frac{3}{2}$
$\frac{3}{2}$
) = Tk. 810