f

src/utils/promotionPricing.js

@@ -7,6 +7,16 @@ export function safeTruncate(num, decimals = 2) {
   return (scaled / factor).toFixed(decimals)
 }
 
+function toTruncatedCents(num) {
+  if (Number.isNaN(num) || !Number.isFinite(num))
+    return 0
+  return Math.trunc((num + Number.EPSILON) * 100)
+}
+
+function centsToFixed(cents) {
+  return (cents / 100).toFixed(2)
+}
+
 function calculatePlatformOverpricingCost(price, config) {
   if (price <= config.p_pricing_standard)
     return 0
@@ -37,10 +47,12 @@ export function calculatePromotionPricing(priceInput, config) {
   const platformOverpricingCost = calculatePlatformOverpricingCost(price, config)
   const superiorOverpricingCost = calculateSuperiorOverpricingCost(price, config)
   const totalCost = baseCost + platformOverpricingCost + superiorOverpricingCost
-  const revenue = price - totalCost
+  const priceCents = toTruncatedCents(price)
+  const costCents = toTruncatedCents(totalCost)
+  const revenueCents = priceCents - costCents
 
   return {
-    costPrice: safeTruncate(totalCost),
-    promotionRevenue: safeTruncate(revenue),
+    costPrice: centsToFixed(costCents),
+    promotionRevenue: centsToFixed(revenueCents),
   }
 }