Answer:
He needs 60000 rupees a year for retirement at 80%
Explanation:
If your current income is 75000 per year, If you need for retirement at 80% of your current income, then the amount you might need for retirement is calculated by 75000 of 80% is
75000 of 80%
= 60000 rupees per year
So, you might need 60000 rupees a year when you retire.