The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 12 g | 29z¢ |
Every additional 6 g or less | 8z¢ | |
Postcards | Per piece | 90¢ |
Tommy sent 3 postcards and a letter. The letter weighed 20 g. How much did Tommy pay in total? Give your answer in terms of z in the simplest form.