Question

the cost of the first class postage increases by $0.23 for each ounce, after the first ounce. the cost of mailing a 14 ounce letter is $3.36. what is the cost of mailing a 2o ounce letter?

Answer 1

y = mx + b

y represents the total cost, m = $0.23

Given: 14 ounce letter cost $3.36

Now let's form the equation.

3.36 = 0.23(13) + b

Now let's find the cost of first ounce.

3.36 = 2.99 + b

b = 3.36 - 2.99

b = $0.37

The cost for 1st ounce = 0.37

Cost for mailing a 20 ounce letter.

0.23*19 + 0.37

= 4.37 + 0.37

= $4,74

The cost of mailing a 20 ounce letter is $4.74

Thank you. :)