Hello @vivianmpoon
I couldn’t avoid a take to this challenge. @hmfa 's workflow is the simplest approach to it; I’ve tested to process the cumulative computation with ‘Moving Aggregator’ + ‘Column Expressions’ node.
It may look too complex for a single column; but it escalates quite easy for complex logistics , as you see in this post. This approach avoids loops and joiners increasing in efficiency.
BR 