Question 4 Lock Co makes a single product, a lock. The etandard cost card for one unit is as follows: A junior member of the accounts team produced a report with the following variances for the month of September, 2020. Required: (a) Prepare a revised report for the month of September, 2020, in the above format, using a flexed budget. ( 8 marks) (b) Explain four general causes of variances. (4 marks) (Total: 12 marks)