In which book of original entry would the following transactions be entered ? Goods sold on credit were returned by a customer and cash was given immediately. A machinery was purchased on credit from M/s XYZ. for ₹ 10,00

In which book of original entry would the following transactions be entered ? Goods sold on credit were returned by a customer and cash was given immediately. A machinery was purchased on credit from M/s XYZ. for ₹ 10,000 for free delivery service. Discount allowed on prompt payment received by company. Certain goods for which the payment is due after 30 days were sold to Y for ₹ 10,000. Payment of salary due to Sananda who resigned from the service and which will be paid on final settlement.