Question

我的价格：20

数量：2

税金：10％

如何计算？

我不知道进行此计算的公式。

Answer 1

您的情况：

XYZ

或更笼统：

var priceWithTax = 20 * 1.10 * 2;

因素的顺序无关紧要。

Answer 2

只需将它们全部相乘：

const price = 20;
const quantity = 2;
const taxRate = 0.1;
const tax = price * quantity * taxRate
const totalPrice = price * quantity + tax;

Answer 3

var price = 20;
var tax = 0.1;
var qty = 2;
//amount includes the tax
var amountWithTax = (qty * price) / (1 - 0.1);
console.log(amountWithTax);
//amount you get after you pay the tax
var amountAfterDeductTax = amountWithTax - (amountWithTax * tax) ;
console.log(amountAfterDeductTax)

如何在JavaScript中计算含税的价格和数量

3 个答案: