Find the difference between the cash price and the payment plan and calculate the interest rate for the following questions.
a food processor for $149.50 cash, or $5.00 down and $10.00 per month for 15 months

Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?