Question
PSLE
The airmail rates to a country are shown.
Type Mass Cost

Letters

First 16 g 28a¢
Every additional 8 g or less 11a¢
Postcards Per piece 70¢

Riordan sent 4 postcards and a letter. The letter weighed 21 g. How much did Riordan pay in total? Give your answer in terms of a in the simplest form.
2 m

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PSLE
The airmail rates to a country are shown.
Type Mass Cost

Letters

First 16 g 28a¢
Every additional 8 g or less 11a¢
Postcards Per piece 70¢

Riordan sent 4 postcards and a letter. The letter weighed 21 g. How much did Riordan pay in total? Give your answer in terms of a in the simplest form.