Solve as much as you can and label the questions 1-3 :) What is the price of a letter that has the following weight?

1 ounce
1.1 ounces
0.9 ounce

A letter costs $0.92 to mail. How much did the letter weigh?
Kiran and Mai wrote some rules to represent the postage function, but each of them made some errors.

K(w)=⎧⎩⎨⎪⎪⎪⎪0.50,0.71,0.92,1.13,0 ≤w≤11≤w≤22≤w≤33≤w≤3.5

M(w)=⎧⎩⎨⎪⎪⎪⎪0.50,0.71,0.92,1.13,0

Identify the error in each person's work and write a corrected set of rules.