The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 8 g | 29y¢ |
Every additional 4 g or less | 7y¢ | |
Postcards | Per piece | 90¢ |
Charlie sent 4 postcards and a letter. The letter weighed 18 g. How much did Charlie pay in total? Give your answer in terms of y in the simplest form.