Since you are earning 25,000 p.m. your yearly income will be 25,000 * 12 = rs.3,00,000
INCOME TAX RATE AMOUNT TO BE PAID 0 - 50,000 No tax NIL
50,001 to 60000-50000= 60,000 10% 10,000 * 10% = 1000
60,001 to 90000*20%= 1,50,000 20% 18,000
1,50,000 to 150000*30%= 8,50,000 30% 45,000
Total Tax payable = 1000 18000 45000= 64,000
Note: In the third slab 150000 to 850000 we have calculated on only 150000 bcos ur total yearly income is 3,00,000. So tax will be calculated on howmuch excess amt on 1,50,000 hence 3,00,000-1,50,000 = 1,50,000. On which we have calculated the tax.
Hope this is helpful.Please feel free to revert for further clarification.