Montant de la remise = Remise (%) × Prix initial
Prix final = (100% - Remise (%)) × Prix initial
Prix final = Prix initial - Montant de la remise
Prix initial=$100, Remise (%)=10%
Montant de la remise = 10% × $100 = $10
Prix final = (100% - 10%) × $100 = $90
Prix final = $100 - $10 = $90