Question

If postage costs $.54 for the first ounce and $.22 for the each additional ounce, calculate the cost of mailing a 10- ounce envelope. A. $2.20

B. $5.08
C. $2.52
D. $5.40

Answer 1

10-first oz=9oz
0.54 for first
0.22 times 9=1.98
total is 1.98+0.54=2.52

C

Answer 2

Hence, the total cost of mailing 10 ounces is:

$ 2.52

Explanation:

If postage costs $.54 for the first ounce and $.22 for the each additional ounce.

i.e. cost of first ounce=$ 0.54.

Now let x denote the number of ounces after the first ounce,

Hence, the cost of x ounces=$ (0.22×x)=$ 0.22 x

Hence, the cost of mailing (x+1) ounces is: $ (0.54+0.22 x)

Now, we have to find the cost of mailing a 10- ounce envelope.

i.e. after the first ounce we need 9 more ounces.

Hence, the total cost of mailing is calculated as:

`=$ (0.54+0.22* 9)\\\\=$ (0.54+1.98)\\\\=$ 2.52\\`

Hence, cost of mailing 10 ounces is:

$ 2.52