Answer:
A) The percentage of tax paid by Karen on the Laptop is 2%
Explanation:
The selling price of the laptop = $1800
The tax amount on laptop = $36
Let us assume the tax paid on the laptop = m %
⇒ m% of the selling price = Tax Amount
or, m % of $1800 = $36

⇒ m = 2 %
or 2 % of $1800 = $36
Hence, the percentage of tax paid by Karen on the Laptop is 2%