Three call options on a stock have the same expiration date and strike prices of 20.30,40. The

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Three call options on a stock have the same expiration date and strike prices of 20.30,40. The market prices are $10, $6, and $3.7 respectively. What is the cost per share for a butterfly spread? If it costs $4.1, answer it as a positive 4.1. Keep one decimal place.