On January 1, Martinez Inc, completed its analysis of the prospects for the Geriatric Toy Store and concluded that there was a 15 percent chance the stock price would be $130 in one year and an 85-percent chance the stock price would be $180. Six months later. Martinez Inc, revised its estimated probabilities to a 30-percent chance of a stock price of $130 and a 70 percent chance of $180, If the market agrees with Martinez Inc.'s revised probabilities, what is the expected change in stock price from Jantary 1 to July 1 ? Assume the discount rate is zero. (Round answer to 2 decimal places, es. 15.25.)