You can write an equation expressing the information you know.

(total income) - 20,000 - (1/2)*((total income) - 20,000) = 6,000

Solving for total income, we have

(total income) - 20,000 - (1/2)*(total income) + 10,000 = 6,000

(1/2)*(total income) = 16,000 (collect terms, add 10,000 to both sides)

You can recognize that "the other half" of the amount not spent on commissions is the Rs 6000 that remains. This means commissions were 6000 and the total is

20,000 + 6,000 + 6,000 = 32,000

(total income) - 20,000 - (1/2)*((total income) - 20,000) = 6,000

Solving for total income, we have

(total income) - 20,000 - (1/2)*(total income) + 10,000 = 6,000

(1/2)*(total income) = 16,000 (collect terms, add 10,000 to both sides)

**(total income) = 32,000**(multiply by 2)You can recognize that "the other half" of the amount not spent on commissions is the Rs 6000 that remains. This means commissions were 6000 and the total is

20,000 + 6,000 + 6,000 = 32,000