sir,
This is Income Tax calculation where for 1st 2,50,000 rupees no tax. For the next 2,50,000 rupees tax is 5%. Above 5 lakh but below 10 lakh tax, it is 20%. Above 10 lakh, tax is 30%.
if taxable income is 450000(4.5 lakh)
for 250000 nil tax
upto 500000 5%...