Q Ltd prepares accounts to 31 March each year. The company made the following two disposals of chargeable assets during the year to 31 March 2024:

(1) 1,250 shares in Hentic Ltd were sold on 28 June 2023 for £25,000. The previous purchases and sales of shares in Hentic Ltd had been as follows:

(2) The company’s factory was sold for £437,500 on 4 March 2024. This factory had been purchased on 11 April 2002 (RPI 175.7) for £285,000.

Note:

The factory purchased in April 2002 was a replacement for a previous factory which had been purchased for £200,000 on 3 January 1992 (RPI 135.6) and sold for £320,000 on 14 June 2002 (RPI 176.2).

Rollover relief was claimed in relation to the June 2002 disposal.

The RPI for December 2017 was 278.1.

Required:

(a) Calculate the chargeable gain arising on the sale of the shares on 28 June 2023.

(b) Calculate the chargeable gain arising on the sale of the factory on 4 March 2024, assuming that a further factory was purchased on 6 November 2023 for £360,000 and that rollover relief is claimed in relation to the March 2024 disposal.