On January $1,$ Swifty 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 $$105$ in one year and an $85-$percent chance the stock price would be $$155.$ Six months later, Swifty Inc. revised its estimated probabilities to a $30-$percent chance of a stock price of $$105$ and a $70$ percent chance of $$155.$ If the market agrees with Swifty Inc's revised probabilities, whaths the expected change in stock price from January $1$ to July $1?$ Assume the discount rate is zero. $($Round answer to $2$ decimal places, e$.$g$.15\mathrm{.}25.)$

Expected change in stock price $($Increase or decrease$)$ of $

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