Deduction under 80TTA in Income Tax

Pay tax on 8k . It is rhe amount exceeded 10k

 You have to show the entire Rs. 18,000/ as income. while u/s 80TTA you get deduction of Rs. 10,000/ therefore only Rs. 8000/- will be taxable. 

If the assessee is a senior citizen (age 60 years or more) then the interest on deposits and savings account can be deducted from gross total income upto an amount of Rs.50000/-.