Question

at a post office always charges a flat one-time fee for any order. One time, Michael sent 35 letters and paid 26 dollars. The next time, he send 18 letters and paid $14.10. How much does the post office charge to send one letter? What is the flat fee?

Answer 1

The post office charges $0.7cents to send one letter, and the fee is $1.5

Explanation: