The amount of sales tax on a purchase varies directly as the price of the item varies. If a computer costs $400 before tax and the tax is $30 tax, which of the following equations is a correct step in solving for how much tax is needed for a computer that costs $500?

Question

The amount of sales tax on a purchase varies directly as the price of the item  varies. If a computer costs $400 before tax and the tax is $30 tax, which of the following equations is a correct step in solving for how much tax is needed for a computer that costs $500?

anonymous · Answer

are you saying that the tax percantage changes

anonymous · Answer

well my options are
400/30 = 500/y
400/30 = x/500
30/400 = 500/y
30x = 200,00
I think they're asking how to figure out how much tax

anonymous · Answer

400/30 = 500/y

anonymous · Answer

That's what I thought, thank you!!