Explanation

The man's monthly income consists of a fixed amount of Rs. 5000 plus a commission of 4% on all his sales.

His total income for the particular month is Rs. 12200.

To find his total sales, we need to first subtract the fixed amount from his total income:

Rs. 12200 (total income) - Rs. 5000 (fixed amount) = Rs. 7200 (commission amount)

Since the commission is 4% of his sales, we can set up the equation:

Commission amount = (4/100) × Total sales

Rs. 7200 = (4/100) × Total sales

To find the total sales, we can divide both sides by (4/100):

Total sales = Rs. 7200 ÷ (4/100)

= Rs. 7200 × (100/4)

= Rs. 180000

So, the correct answer is: 180000