Measures of Central Tendency - Expected Value

Stock Return	Probability of that Return	Expected Return / (Return x Probability)
5%	20%	1.00%
10%	55%	5.50%
20%	25%	5.00%
		1%+5.5%+5% = 11.5%

11.5% = Expected Value of the Stock Return

Hello! I'm confused how they got the 1%, 5.5%, and 5% in the third column?

Can someone write out the equations for me? This feels like it should be obvious but, I can't for the life of me figure it out. Thanks!