How much will it cost to mail a first-class letter that weighs 3.7 oz? the rate is $.22 for the first ounce and $.17 for each additional ounce or fraction of an ounce. a. $.81 b. $.73 c. $.63 d. $.07

I don't know if this will help you, but I keep getting $0.68.
3.7 ounces minus the first ounce = 2.7 ounces
2.7 ounces x $.17/ounce = $0.459 = $0.46
$0.46 (the rate for 2.7 ounces + $0.22 (the rate for the first ounce) = $0.68 

4hours and 40 mins she would be 120 meters high