The selling price of a lamp was $97.50, which included a 7.5 percent sales tax. what was the amount of the sales tax?

The amount of sales tax was $6.81

Step-by-step explanation:

The selling price of the lamp is = $97.50

This price included the 7.5% sales tax.

Let the original price be x

This means

x=90.69

The original price was $90.69

And to know how much was the tax amount we will subtract the original price from selling price.

So, the amount of sales tax was $6.81