I am trying to find a way to create a formula that calculates the following:

If the value of a cell in column A equals a certain criteria, what is the
total value of the cells in column B that meet the crtieria in column A.

For example:
A B
40 120.00
40 30.00
50 40.00
60 50.00

Where you see 40 in the column A, I want to know the total value of column
B, where 40 appers in the corresponding cell in column A.

Can this be achieved with a formula?
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Kind regards

Sara