How is this 576?

A networking company uses a compression technique to encode the message before transmitting over the network. Suppose the message contains the following characters with their frequency:
{a: 5, b: 9, c: 12, d: 13, e: 16, f: 45}
If the compression technique used is Huffman Coding, how many bits will be saved in the message?

the question is incomplete

Total number of characters in the message = 100. Each character takes 1 byte. So total number of bits needed = 800. After Huffman Coding , the characters can be represented with: f: 0 c: 100 d: 101 a: 1100 b: 1101 e: 111 Total number of bits needed = 224 Hence, number of bits saved = 800 - 224 = 576

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