On1st June’16 we sold 500shares for 800pounds. At the time of disposal we had 1000 shares in the share pool with total cost of 1000 pounds. Post disposal we bought following shares:- 7th june’16 300 shares for 450 pounds, 17th june’16 100 shares for 100 pounds, and 27th june’16 200shares for 400 pounds. Then what will be the allowable cost for calculating the capital gain?