The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 8 g | 20v¢ |
Every additional 4 g or less | 9v¢ | |
Postcards | Per piece | 90¢ |
Howard sent 4 postcards and a letter. The letter weighed 18 g. How much did Howard pay in total? Give your answer in terms of v in the simplest form.