The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 8 g | 22s¢ |
Every additional 4 g or less | 6s¢ | |
Postcards | Per piece | 40¢ |
Ben sent 4 postcards and a letter. The letter weighed 15 g. How much did Ben pay in total? Give your answer in terms of s in the simplest form.