The airmail rates to a country are shown.
Type | Mass | Cost |
Letters |
First 16 g | 30k¢ |
Every additional 8 g or less | 11k¢ | |
Postcards | Per piece | 50¢ |
George sent 4 postcards and a letter. The letter weighed 30 g. How much did George pay in total? Give your answer in terms of k in the simplest form.