add find discount factor function

src/utils/cart/findDiscountFactor.ts

@@ -0,0 +1,10 @@
+import { Discount } from "../../model";
+
+
+export function findDiscountFactor(discount: Discount | null | undefined): number {
+    if (!discount) return 1;
+
+    if (discount.Layer === 1) return discount.Target.Products[0].Factor;
+
+    else return discount.Target.Factor;
+}

src/utils/cart/index.ts

@@ -1,4 +1,5 @@
 export * from "./cartDiscount";
+export * from "./findDiscountFactor";
 export * from "./loyaltyDiscount";
 export * from "./privilegeDiscount";
 export * from "./serviceDiscount";