The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 6 g | 27s¢ |
Every additional 3 g or less | 11s¢ | |
Postcards | Per piece | 60¢ |
Oscar sent 3 postcards and a letter. The letter weighed 11 g. How much did Oscar pay in total? Give your answer in terms of s in the simplest form.