UGC NET Paper 1 GA 20 Nov 2021 Shift 1 Solved Paper

Formula Used:
Income $=$ Expenditure $+$ Savings
Average $=($ Sum of the terms $)∕$ Number of the terms $)$
Calculation:
According to the question,
Average monthly expenditure for the first 3 months $=$ Rs. 4,000
Total expenditure for the first 3 months $=4,000\times 3=$ Rs. 12,000
Average monthly expenditure for the next 4 months $=$ Rs. 4,500
Total expenditure for the next 4 months $=4,500\times 4=$ Rs. 18,000
Average monthly expenditure for the next 5 months $=$ Rs. 5,000
Total expenditure for the next 5 months $=5,000\times 5=$ Rs. 25,000
Total expenditure during the year $=12,000+18,000+25,000$
$\Rightarrow 55,000$
Given, total saving during the year $=$ Rs. 5,000
We know that, Income $=$ Expenditure $+$ Savings
Income during the year $=55,000+5,000=$ Rs. 60,000
Average monthly income = Income during the year/Number of months in a year
Average monthly income $=\frac{60,000}{12}=$ Rs. 5,000