Work out the final price after a discount
Calculate the final price after a percentage discount, and how much you save.
final price = original price × (1 − discount %)
How do I stack two discounts, like 20% off then an extra 10%?
Apply them one after another, not added together. 20% then 10% off RM200 is RM200 × 0.8 × 0.9 = RM144 — not the same as a single 30% discount (RM140).
Does this include sales tax?
No — this calculates the discount on the price you enter. Add tax separately if the original price is pre-tax.