The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 10 g | 20a¢ |
Every additional 5 g or less | 11a¢ | |
Postcards | Per piece | 80¢ |
Daniel sent 2 postcards and a letter. The letter weighed 19 g. How much did Daniel pay in total? Give your answer in terms of a in the simplest form.