The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 12 g | 25n¢ |
Every additional 6 g or less | 5n¢ | |
Postcards | Per piece | 60¢ |
Carl sent 3 postcards and a letter. The letter weighed 16 g. How much did Carl pay in total? Give your answer in terms of n in the simplest form.