please explain work

Example 7 - Example 2.8, texthook: Consider Ashok, a recent university graduate trying to summarize typical cash flows for each month. His monthly income is $3500, received at the end of each month. Out of this he pays for rent, food, entertainment, cell and internet charges, and a credit card bill (used for all other purchases). The rent is $1700 per month (including utilities), due at the end of each month. Weekly food and entertainment expenses total roughly $220; his bundled cell, internet, and cable charges are $160 (due at the end of the first week in the month); and his credit card purchases average $600. Credit card payments are due at the end of the second week of each month. Draw a cash flow diagram showing his receipts and disbursements