In Exercises 13 through 26, construct functions to carry out the primary task(s) of the...

In Exercises 13 through 26, construct functions to carry out the primary task(s) of the program.

Cost of Postage The original postage cost of airmail letters was 5 cents for the first ounce and 10 cents for each additional ounce. Write a program to compute the cost of a letter whose weight is given by the user in a text box. See Fig. 5.9. Use a function called Ceil that rounds noninteger numbers up to the next integer. The function Ceil can be defined by Ceil(x) = –Int(–x).