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.
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
12 stamps (a dozen means 12)
12
2
2 and a half.
A dozen refers to a quantity of twelve. Therefore, there are twelve 2 pence stamps in a dozen.
12
You can purchase 1 cent or 2 cent stamps.
41
probally just 1 or 2 42 cent stamps