Opening Entries:

1. **Cash in hand**:
- Debit: Cash in hand Rs 5,000
- Credit: Capital Rs 5,000

2. **Cash at bank**:
- Debit: Cash at bank Rs 20,000
- Credit: Capital Rs 20,000

3. **Stock**:
- Debit: Stock Rs 30,000
- Credit: Capital Rs 30,000

4. **Investment**:
- Debit: Investment Rs 40,000
- Credit: Capital Rs 40,000

5. **Plant and machinery**:
- Debit: Plant and machinery Rs 1,50,000
- Credit: Capital Rs 1,50,000

6. **Debtors**:
- Debit: Debtors Rs 70,000
- Credit: Capital Rs 70,000

7. **Creditors**:
- Debit: Capital Rs 50,000
- Credit: Creditors Rs 50,000

8. **Bills payable**:
- Debit: Bills payable Rs 12,000
- Credit: Capital Rs 12,000

9. **Outstanding rent**:
- Debit: Outstanding rent Rs 10,000
- Credit: Capital Rs 10,000

10. **Capital**:
- Debit: Capital Rs 1,00,000
- Credit: -

Explanation:

1. **Cash in hand**:
- Cash in hand refers to the physical amount of cash available with the business.
- In this case, the opening balance of cash in hand is Rs 5,000.
- It is recorded as an asset in the accounting books.
- The entry debits the cash in hand account and credits the capital account as the cash belongs to the owner.

2. **Cash at bank**:
- Cash at bank represents the amount of cash held in the bank account of the business.
- The opening balance of cash at bank is Rs 20,000.
- It is also recorded as an asset in the accounting books.
- The entry debits the cash at bank account and credits the capital account.

3. **Stock**:
- Stock represents the goods or products held by the business for sale.
- The opening balance of stock is Rs 30,000.
- It is recorded as an asset in the accounting books.
- The entry debits the stock account and credits the capital account.

4. **Investment**:
- Investment refers to the amount of money invested by the owner in the business.
- The opening balance of investment is Rs 40,000.
- It is also recorded as an asset in the accounting books.
- The entry debits the investment account and credits the capital account.

5. **Plant and machinery**:
- Plant and machinery represents the fixed assets of the business, such as equipment and machinery used for production.
- The opening balance of plant and machinery is Rs 1,50,000.
- It is recorded as an asset in the accounting books.
- The entry debits the plant and machinery account and credits the capital account.

6. **Debtors**:
- Debtors are the customers who owe money to the business for goods or services provided on credit.
- The opening balance of debtors is Rs 70,000.
- It is recorded as an asset in the accounting books.
- The entry