You need to answer the question step by step.

29. A retailer received an invoice dated 21 February 2015 worth RM4,350 of goods that included a prepaid freight cost of RM30. The invoice was offered trade discounts of 8% and 5% and cash discount terms of415, 2/20, n/30. (a) Find the last date to settle the invoice. (b) Assume that the retailer paid RM400 on 7 March 2015 and the balance on 14 March 2015. Find the amount of the balance that was paid