The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 20 g | 24z¢ |
Every additional 10 g or less | 6z¢ | |
Postcards | Per piece | 50¢ |
Howard sent 4 postcards and a letter. The letter weighed 28 g. How much did Howard pay in total? Give your answer in terms of z in the simplest form.