Concept:Sales for the year are calculated using the Debtors Account relationship, which links opening debtors, cash received, and closing debtors.Explanation:Cash received from customers adds to sales, while any increase in debtors represents credit sales not yet collected.So, Sales = Cash received from customers + Closing Debtors − Opening Debtors.Closing Debtors = 2,145Opening Debtors = 1,215Change in Debtors = 2,145−1,215=930Cash received from customers = 40,650Therefore, Sales = 40,650+930=41,580Answer:C. D41,580