Answer:
Yes, Sanjay made a 20% profit.
Explanation:
Price of a pen bought by Sanjay = x
Price of packet of 12 pens bought by Sanjay = 12x
Price of packet of 10 pens sold by Sanjay = 12x
Price of pen sold by Sanjay = 12x/10 = 1.2x
Difference between price of pen sold and price of pen purchased = 1.2x - x = 0.2x
0.2 = 20%
Therefore, the profit per pen is 20%