Mini-scenario 2 Penguin Providers ('PP') is a legal practice and charges its customers by the hour. Its customers are all corporate businesses. From the income statement for the year to 31 July 2022, the following information is available: For the year to 31 July 2021 , the gross margin was 42.5% . From the statement of financial position at 31 July 2022, the following information is available: - Client work-in-progress was $348 , 822 , therefore client work-in-progress is 60 days - Client receivables was $426 , 082 , therefore receivable days are 45 . The corresponding figures at 31 July 2021 were client work-in-progress of 30 days and receivables of 40 days. Required 1. Give four possible reasons for the change in PP's gross margin from 2021 to 2022. No calculations are required. (4 marks