A dozen
Its a trick question there are always 12 items in a dozen, it does not matter what they are. so a dozen stamps is 12 no matter what.
There are 12
Yes, there are two cent stamps. They have been available almost since the first stamps were issued. For many decades the postage rate in the US was two cents. Today they are mostly used to add to other stamps to make up a new rate.
12
2
2 and a half.
12
You can purchase 1 cent or 2 cent stamps.
41
probally just 1 or 2 42 cent stamps
In the US you can buy two 10- cent stamps, four 5-cent stamps. five 4-cent stamps, ten 2-cent stamps or twenty 1-cent stamps for 20 cents at most post office windows.