The accounting department of MNO Limited (MNO) provides two sets of data for June. The first data relates to the purchase, and the second data relates to the sales. Table 1. The First Set of Data - Purchases 1st June 1185 units @ 9 6th June 711 units @ 10 11th June 474 units @ 12 19th June 1185 units @11 28th June 158 units @ 13 The following data relates to the sales: Table 2. The Second Set of Data - Sales