Question: Mr. Limbu is an unmarried secondary level Science teacher. His monthly salary is Rs 39,990 with allowance of Rs 2,000. He gets a festival expense which is equivalent to his basic salary of one month and 10% of his salary excluding allowance and festival expense is deducted as provident fund. If 1% social security tax is levied upon the income of Rs 4,00,000, 10% and 20% taxes are levied on the next incomes of Rs 1,00,000 and up to Rs 2,00,000 respectively, how much income tax should he pay in a year?​