The admission tickets for children to watch a magic show were fixed on all days of a week. On Thursday, there were 80 boys and 60 girls at the show. On Friday, the number of boys increased by 30% and the number of girls decreased by 15%. Altogether, $9440 was collected from the sale of admission tickets over the two days.

1. Calculate the number of boys and girls who attended the show on Friday.

Number of boys on Friday = $80 \times (1 + 0.30) = 80 \times 1.3 = 104$
Number of girls on Friday = $60 \times (1 - 0.15) = 60 \times 0.85 = 51$

2. Find the total number of tickets sold over the two days.

Tickets sold on Thursday = $80 + 60 = 140$
Tickets sold on Friday = $104 + 51 = 155$
Total tickets sold = $140 + 155 = 295$

3. Calculate the price of each admission ticket.

Price per ticket = $\char36{}9440 \div 295 = \char36{}32$

1. Find the total number of tickets sold on Thursday.

Total tickets on Thursday = $80 + 60 = 140$

2. Find the number of boys and girls who attended on Friday.

Number of boys on Friday = $80 \times (1 + 0.30) = 80 \times 1.3 = 104$
Number of girls on Friday = $60 \times (1 - 0.15) = 60 \times 0.85 = 51$

3. Calculate the percentage increase in the total number of tickets sold.

Total tickets on Friday = $104 + 51 = 155$
Increase in tickets = $155 - 140 = 15$
Percentage increase = $\frac{15}{140} \times 100\% = \frac{3}{28} \times 100\% = \frac{75}{7}\% = 10\frac{5}{7}\%$