Chartered Accountant
62 Points
Joined February 2016
In line no 2, it says "Actual Rent (less) 10% of the Basic salary", which means, 10% of the basic salary is deducted from actual rent (36,000/-) for calculating the deduction.
While in line 3, the 50/40% of the Basic salary itself is the allowable amount.
For example, if your Basic Salary were 3,00,000 per annum, and you live in a metro city:
Amount under Line 1 = 12000
Amount under Line 2 = 36000 - [ 300000*10% ] = 6000
Amount under Line 3 = 300000 * 50% = 150000
Least of the three (6,000) is allowable.