Lola is in the process of forecasting the sales growth rate for an early-stage venture specializing in the production of durable running shoes. Lola predicts a .2 probability of an 80% growth in sales, a .3 probability of a 60% growth in sales, a .4 probability of a 40% growth in sales, and a .1 probability of a 10% decrease in sales. What is the expected sales growth rate of the venture?