Enatega Restaurant and Rider Application : The total amount is calculated incorrectly when more than one quantity of an item is added

### Describe the bug
The sub-total amount is calculated incorrectly when more than one quantity of an item is added. This leads to inaccurate totals, impacting the functionality of the application (e.g., shopping cart or order summary).
Also the Add-ons price is not adding up in subtotal amount.

### To Reproduce
Steps to reproduce the behavior:

1. Go to 'Enatega Customer Application'
2. Now place an order from any restaurant.
3. Now add a single-product with 2 quantities , see error that the Total will be showing the price of just One quantity that is incorrect.

### Expected behavior

1. The total should correctly multiply the price of an item by its quantity when more than one quantity is added.
2. The total amount displayed should match the expected result for all items in the cart or order.

Smartphone (please complete the following information):

> Device: [e.g. Infinix Hot 50]
> OS: [e.g. Android]
> Browser [e.g. Application]
> Version [e.g. Latest]

Start by reproducing the issue in the Enatega Customer Application with a product quantity of two and with add-ons selected. Trace the cart or order-summary subtotal calculation, then verify that item quantities and add-on prices are included in the displayed total.

Written by the indexing model from the issue text.