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?
Each steak knife set has 4 steak knives and Elizabeth bought 2 sets so there are 4*2 = 
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 steak knives in total.
Each steak knife set costs $80.00 and she bought 2 sets so she spent $80*2 = $
<gadget id="calculator">80*2</gadget>
<output>160</output>
160.00.
Both sets cost $160.00 and there are 8 knives in total so each knife costs 160/8 = $
<gadget id="calculator">160/8</gadget>
<output>20</output>
20.00 each.

<result>20</result>