taxesVal method
Implementation
num taxesVal(
num itemsTotal,
double promo,
num discountAmount,
double taxePercentage,
) =>
(taxePercentage > 0.0
? totalTaxExcludedPromoIncluded(
itemsTotal, promo, discountAmount) *
(taxePercentage / 100)
: 0)
.round();