The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 16 g | 28i¢ |
Every additional 8 g or less | 8i¢ | |
Postcards | Per piece | 50¢ |
Liam sent 4 postcards and a letter. The letter weighed 20 g. How much did Liam pay in total? Give your answer in terms of i in the simplest form.