final BigDecimal[] currentPriceOfToBeDiscountedOrderEntries = {BigDecimal.ZERO};

        bundleProductQuantity.entrySet().stream().flatMap(containerMap -> containerMap.getValue().stream())
                .forEach(orderEntry -> currentPriceOfToBeDiscountedOrderEntries[0] = currentPriceOfToBeDiscountedOrderEntries[0]
                        .add(orderEntry.getBasePrice().multiply(BigDecimal.valueOf(orderEntry.getQuantity()))));

        return currentPriceOfToBeDiscountedOrderEntries[0];