Acell phone charger costs $21. there is a 10% discount this week only. the sales tax is 9%. what is the total of the phone charger including tax? show your work.

The total charge of phone charger after discount and including tax = $20.60

Step-by-step explanation:

Given as :

The cost of cell phone charger = $21

The discount on phone charger = 10%

The sales tax includes = 9%

Now, As the discount is 10% then the cost of phone charger after discount =

        $21 - (10% of $21)

Or, cost after discount = $21 - ()

Or, cost after discount = $21 - $2.1

Or, cost after discount = $18.9

Now the sales tax of 9% added after discount

So , Final price of phone charger = $18.9 + 9% of $18.9

Or, Final price of phone charger = $18.9 + 0.09 × $18.9

I.e Final price of phone charger = $18.9 + $1.701 = $20.60

Hence the Final price of phone charger after discount and sales tax is $20.60    Answer