Final answer:
To calculate the total amount paid, including sales tax, we need to find the selling price and the sales tax on the plasma screen TV. The selling price can be found by adding the original cost and the markup amount. The sales tax is calculated by multiplying the selling price by the sales tax percentage.
Step-by-step explanation:
To calculate the total amount paid, including sales tax, we need to first find the amount of the markup on the plasma screen TV. The markup is 190% of the original cost, which means the store sold it at a price 190% higher than the original cost. We can find the markup amount by multiplying the original cost by the markup percentage:
Markup = Original cost x Markup percentage
Markup = $605 x 190%
Next, we add the markup amount to the original cost to find the selling price:
Selling price = Original cost + Markup
Selling price = $605 + Markup
Now that we have the selling price, we need to calculate the sales tax. The sales tax is 10% of the selling price. We can find the sales tax amount by multiplying the selling price by the sales tax percentage:
Sales tax = Selling price x Sales tax percentage
Finally, we add the sales tax to the selling price to find the total amount Kira paid for the plasma screen TV:
Total amount paid = Selling price + Sales tax