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4.Average
hard
A man spends $Rs.\,1800$ monthly on an average for the first four months and $Rs.\,2000$ monthly for the next eight months and saves $Rs.\,5600$ a $year$. His average monthly income is (in $Rs.$)
Solution
Total expenditure of the man in a year
$=Rs.\,(4 \times 1800+8 \times 2000)$
$=Rs.\,(7200+16,000)=R s.\, 23,200$
Total annual income
$=Rs.\,(23,200+5600)$
$=228,800$
$\therefore \text { Average monthly income }=Rs.\, \frac{28800}{12}=Rs.\, 2400$
Std 13
Quantitative Aptitude
