Sum up all values in a column, except for rows with a checked box in another column

I've got the following data:

And beneath the last visible cell on column C, I want to sum up all values in the cells, but only if their corresponding value on column B (the "Taxed" checkbox) is set to false.

I tried this formula:

=SUM(INDEX(QUERY(B2:C11, "WHERE B = FALSE" , 1), , 2))

But it doesn't work well. It gives me $169.30, but it should be $115.23.

Is there any way I could fix my formula, or do I need to use something else?