Taggart Inc.'s stock has a 50% chance of producing a 31% return, a 30% chance of producing a 10% return, and a 20% chance of producing a -20% return. What is the firm's expected rate of return? Do not round your intermediate calculations. 

a. 14.50%  

b. 18,50% 

c. 20.33%

d. 16.50%

e. 21,00%