Write in C$++$ please : Project Description

Create a program that calculates the all items total, the discount amount, the subtotal, the sales tax amount, and the grand total for the department store. The program asks the sales associate to enter the cost of an item repeatedly until she or he enters zero to terminate the data entries. The associate should enter the current sales tax rate and the promotion code for the customer as well.

Sample Run

Department Store Sales Tax and Grand Total Application

Data Entries: Enter $0$ to end your input$$Cost of item: $35\mathrm{.}99$Cost of item: $27\mathrm{.}50$Cost of item: $19\mathrm{.}59$Cost of item: $0$All items total: $$83\mathrm{.}08$

Promotion code: $123$Discount amount: $$1\mathrm{.}00$Subtotal: $$82\mathrm{.}08$

Sales tax rate $(\%)$: $6$Sales tax amount: $$4\mathrm{.}92$

Grand total: $$87\mathrm{.}00$

Continue? y$/$Y$/$n$/$N: y

Data Entries: Enter $0$ to end your input$$Cost of item: $10\mathrm{.}99$Cost of item: $35\mathrm{.}50$Cost of item: $11\mathrm{.}52$Cost of item: $21\mathrm{.}58$Cost of item: $0$All items total: $$79\mathrm{.}59$

Promotion code: $456$Discount amount: $$2\mathrm{.}00$Subtotal: $$77\mathrm{.}59$

Sales tax rate $(\%)$: $12$Tax rate should be from $6$ to $10$Sales tax rate $(\%)$: $9$Sales tax amount: $$6\mathrm{.}98$

Grand total: $$84\mathrm{.}57$

Continue? y$/$Y$/$n$/$N: y

Data Entries: Enter $0$ to end your input$$Cost of item: $95\mathrm{.}21$Cost of item: $0$All items total: $$95\mathrm{.}21$

Promotion code: $999$Invalid promotion code. Try again$$Promotion code: $789$Discount amount: $$3\mathrm{.}00$Subtotal: $$92\mathrm{.}21$

Sales tax rate $(\%)$: $10$Sales tax amount: $$9\mathrm{.}22$

Grand total: $$101\mathrm{.}43$

Continue? y$/$Y$/$n$/$N: Y

Data Entries: Enter $0$ to end your input$$Cost of item: $152\mathrm{.}50$Cost of item: $59\mathrm{.}80$Cost of item: $0$All items total: $$212\mathrm{.}30$

Sales tax rate $(\%)$: $8$

Discount amount: $$21\mathrm{.}23$Subtotal: $$191\mathrm{.}07$Sales tax amount: $$15\mathrm{.}29$Grand total: $$206\mathrm{.}36$

Continue? y$/$Y$/$n$/$N: N

Program is terminated

Specifications

$*$ The sales tax rate is from $6\%$ to $10\%.$

$*$ The system accepts only the following promotion codes for a discount amount:

$*123($$$1$ discount$)$

$*456($$$2$ discount$)$

$*789($$$3$ discount$)$

$*0($no discount$)$

$*$ If the all items total is $$100$ or more, the discount amount is $10\%$ of the total. No other discounts are applied.$$

$*$ The subtotal, the sales tax amount, and the grand total are calculated as follows:

$*$ subtotal $=$ all items total $-$ discount amount

$*$ sales tax amount $=$ subtotal $*($sales tax rate $/100)$

$*$ grand total $=$ subtotal $+$ sales tax amount

$*$ Your project source file should contain the following functions:

$*$ int main$()$

$*$ void display$\_$title$()$: Displays the title of the application.

$*$ double get$\_$all$\_$items$\_$total$()$: Gets all the costs of items and returns the total.

$*$ double get$\_$discount$($double total$)$: Returns a discount amount which is based on the total. It could be $$1,$ $$2,$ $$3,$ $$0,$ or $10\%$ if the total is $$100$ or more.

$*$ double get$\_$sales$\_$tax$($double subtotal$)$: Returns the sales tax amount which is based on the subtotal.