Yes you can multiply using calculated column but there are some limitations as below:
Only columns from an immediate parent table can be used in a calculated column.
Saved queries, charts, and visualizations can have a maximum of 50 unique calculated columns.
Calculated columns can reference other calculated columns in their formula, but they can't reference themselves. Calculated columns don't have values when a user with mobile client is offline.
MaxValue and MinValue column definitions properties can't be set on calculated columns
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Thanks Akash