Four teachers, five girls and two boys went as a group on a visit to a place. They contributed the following amounts towards the expenses. The teachers contributed Rs. 100 each, the girls Rs. 30 each and the boys Rs. 25 each. What percent of the total expenditure did each girl pay?
16%
4%
15%
5%
Solution
The total contribution by teachers $=4 \times 100 =400$
The total contribution by the girls $=5 \times 30=150$
The total contribution by the boys $=2 \times 25=50$
So, total combined contribution = Rs.600
Contribution of each girl as a fraction of the total
$=\dfrac{30}{600}=\dfrac{1}{20}=5\%$