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?

Answer: Option A

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 = $$\frac{70\times 50}{100}=\text{Rs}\text{. 35}$$
Now, that 35 must be equal to his saving and rent i.e.
35 = 2800 then,
1 = $$\frac{2800}{35}$$
100 = $$\frac{2800\times 100}{35}=\text{Rs}\text{. 8000}$$
So, his income = Rs. 8000