Each year a school organises a concert.
(a) i) in 2004 the cost of organising the concert was $385.
In 2005 the cost was 10% less than in 2004.
Calculate the cost in 2005.
ii) The cost of $385 in 2004 was 10% more than the cost in 2003.
Calculate the cost in 2003.
(b) i) In 2006 the number of tickets sold was 210.
The ratio Number of adult tickets: Number of student tickets was 23:19.
How many adult tickets were sold?
ii) Adult tickets were $2.50 each and student tickets were $1.50 each.
Calculate the total amount received from selling the tickets.
iii) In 2006 the cost of organising the concert was $410.
Calculate the percentage profit in 2006.
(c) In 2007, the number of tickets sold was again 210.
Adult tickets were $2.60 each and student tickets were $1.40 each.
The total amount received from selling the 210 tickets was $480.
How many student tickets were sold?
Cambridge IGCSF