Weighted Average for Email Open Rate

My data table, called "Email Stats" contains analytics for each email campaign. I'm trying to create a new measure that calculates the weighted average of email open rate across all 50 email campaigns (rows).  

I'm a new Power BI user and having trouble getting this calculation to work. Can someone help me with the correct syntax for the weighted average of the email open rate.

 COL A              COL B

Opens:             Open Rate:

32                     62%

1055                 26%

334                   36%

67                     14%

Excel formula to calculate weighted average of Open Rate:

=SUMPRODUCT(B2:B5,A2:A5)/SUM(A2:A5)

28%