16. (3 points) From five stamps with a face value of 1 yuan and four stamps with a face value of 1.60 yuan, if one or several stamps are taken, the number of different postage amounts that can be formed is $\qquad$ kinds.
【Answer】Solution: According to the analysis, we get: $6 \times 5-1=29$ (types);

Answer: 29 different postage rates can be formed. Therefore, the answer is: 29.