The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 6 g | 20p¢ |
Every additional 3 g or less | 9p¢ | |
Postcards | Per piece | 90¢ |
Xavier sent 3 postcards and a letter. The letter weighed 11 g. How much did Xavier pay in total? Give your answer in terms of p in the simplest form.