The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 12 g | 22s¢ |
Every additional 6 g or less | 7s¢ | |
Postcards | Per piece | 70¢ |
Tommy sent 3 postcards and a letter. The letter weighed 28 g. How much did Tommy pay in total? Give your answer in terms of s in the simplest form.