A few years ago, Lance bought 7 acres of land at a cost of £28,000. He sold 3 acres of the land on 10 September this year at auction. The gross proceeds of sale were £30,000 and the auctioneer's commission was 5% of the proceeds which was deduced from the proceeds of sale. The remaining 4 acres of land were valued at £20,000 on the date of the auction.
What was Lance's chargeable gain on sale of the three acres of land?