please write a program in c$++$ that Ask the user for the price of a phone and the number of phones he$/$she wants to purchase.

Calculate and display subtotal, tax amount, and total price.

Set the tax rate of $8\mathrm{.}75\%$ as a constant value.

Note: Bold info is input from user. Make sure to give an error message if a negative number is inputted by the user. Do not forget to add comments to your code.

Sample Dialogue:

Price: $45\mathrm{.}99$

Number of phones: $2$

Subtotal: $$91\mathrm{.}98$

Tax: $$8\mathrm{.}05$

Total: $$100\mathrm{.}03$