Narayan spends 30% of his income on education and 50% of the remaining on food. He gives Rs. 1000 as monthly rent and now has Rs. 1800 left with him. What is his monthly income?

Explanation:-

Narayan's saving and rent = 1000+1800 = Rs. 2800
Let his monthly income be Rs. 100.
30% of his income he spent on education i.e. Rs. 30.
Remaining = 100 -30 = 70
50% of remaining on food = (70*50)/100 = Rs.35
Now, that 35 must be equal to his saving and rent i.e.
35 = 2800 then,
1 = 2800/35
100 = (2800*100)/35 = Rs. 8000
So, his income = Rs. 8000.