Here are the journal entries for the transactions:
1. Sold goods to X for cash Rs. 55,000
Dr. Cash Rs. 55,000
Cr. Sales Rs. 55,000
2. Deposited Rs. 50,000 into bank
Dr. Bank Rs. 50,000
Cr. Cash Rs. 50,000
3. Purchased stationery Rs. 400
Dr. Stationery Rs. 400
Cr. Cash Rs. 400
4. Purchased goods from Sen on credit Rs. 2,00,000
Dr. Sen Rs. 2,00,000
Cr. Purchases Rs. 2