Income of a man is increased by 1800 and payable tax is decreased from 18% to 15% in both cases 29.95 income is tax free

Income of a man is increased by 1800 and payable tax is decreased from 18% to 15% in both cases 29.95 income is tax free and he is paying same tax amount. Find initial income(in Rs.)

(a)          9000

(b)          6000

(c)           5000

(d)          10000

Sol:

If tax rate decreases from 18% to 15% Income should change from

15 → 9000 Rs.