word problem

Question

The monetary systems in Australia and New Zealand have six coins: 5 cent,20 cent,50cent, $1 and $2. The price of any item is rounded to the nearest 5 cents.At the end of the Ellen's vacation in New Zealand she two $2 coins. Shw wants back at least one of each of the six coins. How many ways can she exchange one of the $2 coins for the remaining five coins?

Answer 1

But you have only listed five coins (0.05, 0.20, 0.50, 1 & 2).  Is the missing one 0.10 ?