The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 16 g | 25w¢ |
Every additional 8 g or less | 8w¢ | |
Postcards | Per piece | 60¢ |
Eric sent 4 postcards and a letter. The letter weighed 21 g. How much did Eric pay in total? Give your answer in terms of w in the simplest form.