Can I work backwards from original and final price?

Yes. Switch to reverse mode to compute the savings amount and implied discount percentage.

How is the final price computed?

Final price = original price - (original × discount percent / 100). Savings is the difference.

Not directly. Apply the first discount, then use that result as the new original price for the second.

Forward mode accepts 0 to 100 percent in steps of 0.1. Reverse mode has no cap, so a final price above the original simply reports a negative saving.

No. Both prices are treated as entered, so apply tax to the final price yourself if your local price tags exclude it.

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Can I work backwards from original and final price?: Yes. Switch to reverse mode to compute the savings amount and implied discount percentage.
How is the final price computed?: Final price = original price - (original × discount percent / 100). Savings is the difference.
Does it handle stacked discounts?: Not directly. Apply the first discount, then use that result as the new original price for the second.
Is there a limit on the discount percentage?: Forward mode accepts 0 to 100 percent in steps of 0.1. Reverse mode has no cap, so a final price above the original simply reports a negative saving.
Does it include sales tax or VAT?: No. Both prices are treated as entered, so apply tax to the final price yourself if your local price tags exclude it.