I would appreciate it if you solve the transactions by explaining and explaining in detail, thank you

The REX Company experiences the following unrelated events and transactions during Year 1. The company's existing current ratio is 2:1 and its quick ratio is 1.2:1. 1. REX wrote off $5,000 of accounts receivable as uncollectible. (Assumes a sufficient amount is provided for in the Allowance for Bad Debts.) 2. A bank notifies REX that a customer's check for $411 is returned marked insufficient funds. The customer is bankrupt. 3. The owners of REX Company make an additional cash investment of $7,500. 4. Inventory costing $600 is judged obsolete when a physical inventory is taken. 5. REX declares a $5,000 cash dividend to be paid during the first week of the next reporting period. 6. REX purchases long-term investments for $10,000. 7. Accounts payable of $9,000 are paid. 8. REX borrows $1,200 from a bank and gives a 90-day, 6% promissory note in exchange. 9. REX sells a vacant lot for $20,000 that had been used in its operations. 10. A three-year insurance policy is purchased for $1,500. Required: Separately evaluate the immediate effect of each transaction on the company's: a. Current ratio b. Quick (acid-test) ratio C. Working capital