Taggart Inc's stock has a 50% chance of producing a 21% return, a 30% chance of producing a 10% return, and a 20% chance of producing a -28% return.What is the firms expected rate of return?

Question

Taggart Inc's stock has a 50% chance of producing a 21% return, a 30% chance of producing a 10% return, and a 20% chance of producing a -28% return.What  is the firms expected rate of return?

Please help