Property Business income

Hi. i asked 2 other questions on the forums but i unfortunately didnt get a response. Im hoping to get one for this question because i desperately need an explanation. This is a section C question from the revision kit. Please explain how to calculate the rent received aspect of this question and why the rent is multiplied by 1/3.

E – commerce pie has claimed a deduction for repairs of £95,300 in respect of awarehouse which was purchased on 21 May 2021. The warehouse was purchased in a dilapidated state, and could not be let until the repairs were carried out. This fact was represented by a reduced purchase price. The property was first let out on 1 July 2021.

E-Commerce pie did not receive the rent due of £16,200 in respect of this warehouse for the quarter ended 31 May 2022 until 1 April 2022. None of this amount has been taken into account in calculating the property business profit for the year ended 31 March 2022.

Property income -156,700

Please assist me with this question!