please solve this in 15minutes

Which of the following statement(s) is/are related to variable costs? I. Its per unit cost remains fixed regardless of the production volumes. II. It remains constant in total within a relevant range of activity. Ill. It stays within a specific range of activity despite changes in production volume. IV. It changes in proportion to changes in volume or activity. Select one: O A. II and IV. O B. II and III. O C. I and II only. O D . I and IV only. Jack Tan Enterprise purchased RM40,000 worth of goods on 1 June 2022 with credit terms 5/10, n/30. Upon arrival, goods totalling RM1,000 were damaged in transit and immediately rejected. Jack Tan Enterprise paid the supplier on 15 June. Determine the amount of cash paid by Jack Tan Enterprise. Select one: O A. RM40,000 O B. RM39,000 O C . RM37,050 O D. RM38,000