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4.Average
hard
Visitors to a show were charged $Rs.\,15.00$ each on the first day, $Rs.\, 7.50$ on the second and $Rs.\, 2.50$ on the third day. Visitors total attendance for three days were in the ratio $2: 5: 13$ . Find out the average charge per visitor for the entre show. (in $Rs.$)
A
$7$
B
$5$
C
$9$
D
$11$
Solution
Let, attendance on first, second and third day be $2 , 5$ and $13,$ respectively. Total number of visitors for three days $=2+5+13=$ $20$
Total amount of money collected
$=2 \times 15+5 \times 7.50+13 \times 2.50$
$=30+37.5+32.5=100$
Average charge per person $=\frac{100}{20}=5.$
Std 13
Quantitative Aptitude