Journal Entries:

1. Jan 1: Started business with a capital of ₹80,000.

Journal Entry:
```
Cash A/C Dr. ₹80,000
To Capital A/C ₹80,000
(Being capital introduced in the business)
```

2. Purchased goods for ₹21,000.

Journal Entry:
```
Purchases A/C Dr. ₹21,000
To Cash A/C ₹21,000
(Being goods purchased)
```

3. Bought furniture for ₹20,000.

Journal Entry:
```
Furniture A/C Dr. ₹20,000
To Cash A/C ₹20,000
(Being furniture purchased)
```

5. Sold goods for ₹18,000.

Journal Entry:
```
Cash A/C Dr. ₹18,000
To Sales A/C ₹18,000
(Being goods sold for cash)
```

6. Sold goods to Mr. K on credit for ₹15,000.

Journal Entry:
```
Mr. K A/C Dr. ₹15,000
To Sales A/C ₹15,000
(Being goods sold on credit to Mr. K)
```

8. Purchased goods from Mr. D on credit for ₹6,000.

Journal Entry:
```
Purchases A/C Dr. ₹6,000
To Mr. D A/C ₹6,000
(Being goods purchased on credit from Mr. D)
```

16. Cash received from Mr. I ₹14,950. Allowed him a discount of ₹50.

Journal Entry:
```
Cash A/C Dr. ₹14,950
Discount Allowed A/C Dr. ₹50
To Mr. I A/C ₹15,000
(Being cash received from Mr. I and discount allowed)
```

18. Paid cash to Mr. D ₹2,000.

Journal Entry:
```
Mr. D A/C Dr. ₹2,000
To Cash A/C ₹2,000
(Being cash paid to Mr. D)
```

22. Drawings for personal use ₹2,000.

Journal Entry:
```
Drawings A/C Dr. ₹2,000
To Cash A/C ₹2,000
(Being cash withdrawn for personal use)
```

25. Opened a bank account by depositing ₹11,000.

Journal Entry:
```
Bank A/C Dr. ₹11,000
To Cash A/C ₹11,000
(Being amount deposited in the bank)
```

26. Cash sales ₹5,000.

Journal Entry:
```
Cash A/C Dr. ₹5,000
To Sales A/C ₹5,000
(Being cash sales)
```

31. Rent paid ₹2,000.

Journal Entry:
```
Rent A/C Dr. ₹2,000
To Cash A/C ₹2,000
(Being rent paid)
```

31. Salary paid ₹3,500.

Journal Entry:
```
Salary A/C Dr. ₹3,500
To Cash A/C ₹3,500
(Being salary paid)
```