The following costs were incurred for the year ended 30 June 2023 by a taxpayer in business. i) A programmable calculator purchased on 1 January 2023 at a cost of $280. It is estimated to have a life of four years. ii) The electric wiring in the building was replaced at the cost of $1,990. iii) A second-hand machine for use in manufacturing operations purchased at a cost of $7,200. The machine had been used for 2 years by its previous owner and the taxpayer estimates he will only gain a further 5 years' service from it. However, on first using the machine the taxpayer discovers it will not operate due to a damaged cylinder in the engine. This is replaced at a cost of $800