32 Determine the last date for payment within the (i) interestfree period (if applicable) and (ii) credit period for an invoice dated 28 April, under each of the following credit terms:

a net 30 days from invoice date b net 20 days from invoice date; 1% cash discount if paid within 7 days c net 60 days from invoice date; 2% cash discount if paid within 10 days.