On January 1, FinCorp Inc. completed its analysis of the prospects for the Geriatric Toy Store and concluded that there was a 25-percent chance the stock price would be $150 in one year and a 75-percent chance the stock price would be $200. Six months later, FinCorp Inc. revised its estimated probabilities to a 40-percent chance of a stock price of $150 and a 60-percent chance of $200. If the market agrees with FinCorp Inc.'s revised probabilities, what is the expected change in stock price from January 1 to July 1? Assume the discount rate is zero.