[O] Spreadsheet formula evaluation without using tables?

[Asif]

Is it possible to have a list of tasks each with a formula to track progress in percentage based on other subtasks? The result will look like this:

* [ 30%] Project Name

** [ 50%] Task A

** [ 10%] Task B

This is what my formula in lisp will look like:

* [(format "%3d" (+ (* TASKA 0.5) (* TASKB 0.5) ))%] Project Name

** [(format "%3d" (setq TASKA 50)%] Task A

** [(format "%3d" (setq TASKA 10)%] Task B

All I need to do is evaluate the code in org-mode to get the result.

Is this possible?

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Asif