Cart Total Calculator

A cart contains items with a price and quantity. Build a summary that calculates subtotal, discount, tax, and final total.

Write these functions:

• calculateSubtotal(items) should add price * quantity for every item.

• calculateDiscount(subtotal, discountPercent) should return the discount amount.

• calculateTax(amountAfterDiscount, taxPercent) should return the tax amount after the discount.

• createCartSummary(items, discountPercent, taxPercent) should return an object with subtotal, discount, tax, and total.

Sample checks:

const cartItems = [  { name: 'Notebook', price: 10, quantity: 2 },  { name: 'Pen', price: 2, quantity: 5 },  { name: 'Bag', price: 30, quantity: 1 },];console.log(createCartSummary(cartItems, 10, 5));console.log(calculateSubtotal(cartItems));const singleItemCart = [{ name: 'Mouse', price: 25, quantity: 2 }];console.log(createCartSummary(singleItemCart, 0, 10));

Expected output:

{ subtotal: 60, discount: 6, tax: 2.7, total: 56.7 }60{ subtotal: 50, discount: 0, tax: 5, total: 55 }

The subtotal must include every item and multiply each item's price by its quantity.