Jake is in the process of forecasting the sales growth rate for an early-stage venture specializing in the production of durable running shoes. Jake predicts a 0.20 probability of an 80% growth in sales, a 0.30 probability of a 60% growth in sales, a 0.40 probability of a 40% growth in sales, and a 0.10 probability of a 10% decrease in sales. What is the expected sales growth rate of the venture?

a. 47%

b. 49%

c. 51%

d. 53%