Answer:
![A=P+P* S\%](https://img.qammunity.org/2021/formulas/mathematics/high-school/iuad51uuyh95lwn83sf6kzjmqgqzekn4zw.png)
Explanation:
For calculating the sales tax of a product, it is required to first multiply the original cost price of the product by the sales tax percentage.
Once the sales tax has been computed add it to the original cost price in order to determine the total cost of the product.
The formula of final amount is:
![A=P+P* S\%](https://img.qammunity.org/2021/formulas/mathematics/high-school/iuad51uuyh95lwn83sf6kzjmqgqzekn4zw.png)
Here,
A = final amount
P = original cost price
S = sales tax percentage