How much postage for 2 ounce letter?

As of May 2011, a standard #7, #9, #10, #11, 6x9", A-2, A6, A7 sized envelopes

are $0.44 for the first ounce. Over 1 ounce and up to 2 ounces will mean an extra $0.20 for additional ounces. So up to 2 oz will be $0.64 / Up to 3 oz will be $0.84 / up to 3.5oz will be 1.04 But 3.5oz to 4 oz becomes 1.48 (Yes over 3.5 oz and they add another $0.44 - Dont ask! It's the Post Office! and Guess what!?! Over 4 oz they go back to adding $0.20 and so 4.1 - 5.0 oz is $1.68)-Ron