To calculate the age analysis for the creditor, we need to consider the purchases made in each month and any payments made.
1. Total purchases made in April, May, June, and July 2022:
R440 (April) + R390 (May) + R820 (June) + R650 (July) = R2300
2. Total payment made for June 2022:
R2300 - R650 (July) = R1650
3. Age analysis:
3.1 The 0-30 days amount due:
R650 (July) = R650
3.2 The balance due by M. Lake:
R390 (May) + R440 (April) = R830
3.3 The interest charged:
R1650 (Total Due) - R2300 (Total Purchases) = R-650 (overpayment, no interest charged)