From the following details, calculate net profit before tax:

Net Profit after tax is Rs. 50,000;

15% Long-term debt 12,00,000;

Tax rate 20%.

The correct option is 62,500.

To understand why this is correct, we need to calculate the Net Profit Before Tax using the given Net Profit After Tax and the Tax Rate.
The formula relating Net Profit After Tax and Net Profit Before Tax is:

$$\text{Net Profit after tax}=\text{Net Profit before tax}\times (1-\text{Tax rate})$$

Given details in the question:
1. Net Profit after tax = Rs. 50,000
2. Tax rate = 20% (or 0.20 in decimal form)
Note: The details also mention 15% Long-term debt of Rs. 12,00,000, but interest on long-term debt is already deducted to arrive at net profits. Therefore, it is not required for calculating Net Profit Before Tax from Net Profit After Tax.

Let Net Profit before tax be represented as X. Substituting the values into the formula:

$$50,000=X\times (1-0.20)$$

$$50,000=X\times 0.80$$

Solving for X:

$$X=\frac{50,000}{0.80}$$

$$X=62,500$$

Thus, the Net Profit Before Tax is Rs. 62,500.