Discount on price inclusive or original price

Dear zatca team,

can you please confirm when we should calculate vat if we have discount 10%.

item price inclusive = 115 —100.00 original price - 15.00 vat

should we apply discount on 10% on 115 SAR or we should calculate original price before discount and then apply discount?

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TotalPrice - Discount = NetPrice ……+ 15 % VAT = Vat Inclusive