At the start of a trading session, Prakash bought a few shares of a company at Rs. 532 per share. Afer some time, he

again bought a few more shares of the same company at Rs. 504 per share. Again at the end of the session, he

bought sell more shares of the same company at Rs. 486 per share. The next day, he sold all the shares at Rs. 556.6

and earned a profit of 10%. If he bought 37 shares in all, how many shares were purchased at Rs. 532?