Study the given income tax rates fixed by IRD and work out the following problems:

Steps to Solve

1. Calculate Tax for the Unmarried Civil Officer

First, we need to find the total income of the unmarried civil officer:

• Monthly income = Rs 37,990
• Dashain expense = Rs 37,990 (one month's salary)

Total income = $37,990 + 37,990 = Rs 75,980$

Now, we apply the tax rates based on the taxable income brackets for individuals.

Breakdown:

• First Rs 40,000 taxed at 19%: $$ 40,000 \times 0.19 = Rs 7,600 $$

• Next Rs 35,980 taxed at 20% (as $75,980 - 40,000 = 35,980$): $$ 35,980 \times 0.20 = Rs 7,196 $$

Total tax: $$ Tax_{individual} = Rs 7,600 + Rs 7,196 = Rs 14,796 $$

2. Calculate Tax for the Married Couple

For the couple:

• Monthly income = Rs 40,500
• Festival expense = Rs 6,000

Total income = $40,500 + 6,000 = Rs 46,500$

Now, applying the tax rates:

• First Rs 45,000 taxed at 10%: $$ 45,000 \times 0.10 = Rs 4,500 $$

• Remaining Rs 1,500 taxed at 20% ($46,500 - 45,000$): $$ 1,500 \times 0.20 = Rs 300 $$

Total tax: $$ Tax_{couple} = Rs 4,500 + Rs 300 = Rs 4,800 $$

3. Calculate Net Interest Earned by Mrs. Gana

Mrs. Gana deposited Rs 2,000 at a rate of 6% per annum.

Net interest earned in one year: $$ Interest = Principal \times Rate \times Time = 2000 \times 0.06 \times 1 = Rs 120 $$

4. Calculate Total Amount for Mr. Tusal

Mr. Tusal's deposit: Principal = Rs 1,200 at 6% for 1 year.

Total amount after 1 year: $$ Total = Principal + Interest = 1200 + (1200 \times 0.06) = 1200 + 72 = Rs 1,272 $$

5. Calculate Amount Received by Mrs. Thakuri

Assuming Mrs. Thakuri's deposit at the highest interest rate of 6% for 3 years on Rs 2,000.

Interest after 3 years: $$ Total Interest = Principal \times Rate \times Time = 2000 \times 0.06 \times 3 = Rs 360 $$

Total amount received: $$ Total = Principal + Total Interest = 2000 + 360 = Rs 2,360 $$

6. Determine Money Deposited by Mrs. Malla

Mrs. Malla paid Rs 1,000 as tax and repaid Rs 1,300.

The difference charged as income tax is: $$ 1,300 - 1,000 = Rs 300 $$

This amount is the interest on the tax owed. To find the original deposited money (denote as $x$), we consider:

• Total paid = Principal + Interest.

Assuming the interest rate is 6%: $$ 300 = x \times 0.06 $$ Thus, solving for $x$ gives: $$ x = \frac{300}{0.06} = Rs 5,000 $$