The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 16 g | 25b¢ |
Every additional 8 g or less | 9b¢ | |
Postcards | Per piece | 70¢ |
Andy sent 4 postcards and a letter. The letter weighed 39 g. How much did Andy pay in total? Give your answer in terms of b in the simplest form.