C. What are the no arbitrage lower and upper bound prices

On Wednesday, April 27, 2016, three call options on ABC stock, all expiring on April 18, 2017, are sold for the following closing prices: Consider a " long butterfly spread" strategy with the following positions - buy 1 call at $50, sell 2 calls at $60 and buy 1 call at $70. To answer the following questions: Draw the expiration-date payoff diagram. Mark the maximum payoff using actual quotes provided above. Draw the expiration-date P/L diagram. Mark the breakeven stock prices, the maximum profit, and the maximum loss using actual quotes. Determine the no-arbitrage upper- bound and lower-bound prices of the $60 strike call