try this instead:
handleCalculateTotal() {
const { items, taxRate, discountRate } = this.state;

let subTotal = items.reduce((acc, item) => {
return acc + parseFloat(item.price) * parseInt(item.quantity);
}, 0);

// Ensure subTotal is a floating point number with two decimal places
subTotal = parseFloat(subTotal.toFixed(2));

const taxAmmount = parseFloat((subTotal * (taxRate / 100)).toFixed(2));
const discountAmmount = parseFloat((subTotal * (discountRate / 100)).toFixed(2));
const total = parseFloat((subTotal - discountAmmount + taxAmmount).toFixed(2));

this.setState({
subTotal,
taxAmmount,
discountAmmount,
total
});
}

Total-calc-error #20

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