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4.Average
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The average expenditure of a man for the first five months is $Rs.\, 120$ and for the next seven months is $Rs. \,130$ . His monthly average income in $Rs.$ if he saves $Rs. \,290$ in that year, is
A
$160$
B
$170$
C
$150$
D
$140$
Solution
Total expenditure for first $5$ months $=120 \times 5=600$ Rs.
Total expenditure for next $7$ months $=130 \times 7=910$ Rs.
Total income = Total expenditure of the whole year + saving
$=600+910+290=1800 \,Rs.$
Monthly average income $=\frac{1800}{12}=150$ $Rs.$
Standard 13
Quantitative Aptitude
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