In a certain country, a letter up to 1 ounce requires postage in the amount of $0.42, and each additional ounce (or fraction of an ounce) has an additional cost. the function below represents the cost of mailing one letter in this country. f(c)=0.42 + 0.20[x-1] josiah has two letters. the first weighs 2.9 ounces, and the second weighs 4.1 ounces. what is the total amount josiah can expect to pay for postage? $1.62 $1.64 $1.84$2.04