A small business has 15 canoes that it rents for float trips down the river. The pricing structure offers a discount for group rentals. One canoe rents for $40, two rent for $38 each , three rent for $36 each , and in general the group rate per canoe is found by taking $2 off the base of $40 for each extra canoe rented . The information given in this problem can restrict the values we need to consider . Suppose n = the number of canoes rented , then the values that we should consider for n are between ___ and ___ *