Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Elizabeth wants to buy the steak knives from a bridal registry as a wedding gift.  The couple registered for 2 steak knife sets and each set contains 4 steak knives.  If Elizabeth buys both sets and they cost $80.00 per set, how much does each single steak knife cost?

### Response:
Both sets cost $80.00 and there are 2 sets so that's 80*2 = $<<80*2=160.00>>160.00
Each steak knife set has 4 steak knives and Elizabeth bought 2 sets so that's 4*2 = <<4*2=8>>8 steak knives
Both sets cost $160.00 and there are 8 knives in the sets so each knife costs 160/8 = $<<160/8=20.00>>20.00 each
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