How many stamps do i need for $1.99??

ok im sending a package to my friend who lives in another state, and the package is a large envelope and it weighs 1/2 a pound. so i did the math on usps.com and it says i need $1.99 worth of stamps. and i can send it from my house if its less than a pound. but i dont know how many stamps or which stamps to put on... show more ok im sending a package to my friend who lives in another state, and the package is a large envelope and it weighs 1/2 a pound. so i did the math on usps.com and it says i need $1.99 worth of stamps. and i can send it from my house if its less than a pound. but i dont know how many stamps or which stamps to put on it.

help please! thanks(:
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