Running total for multiple items solved by array formula
There are some stuff dealers. In the following table is list of their sales. We need to know, how many sales they made from the beginning of the year. But there is a problem, we need to know sum to the date in each record for the dealer. For example: Jack Smith sold 1 piece on 2011/01/07 and then 3 pieces on 2011/01/19. So total to 2011/01/07 is 1, but total to 2011/01/19 is 4 (1+3).
Question is how to create running total for each dealer in the table.
This is array formula for the first record.
Note: Correct location of $ character is important.