SOLUTION: The sales tax on a car that sold for $13,000 is $910. At the same rate, how much higher is the sales tax on a car that sells for $18,000?

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Question 926957: The sales tax on a car that sold for $13,000 is $910. At the same rate, how much higher is the sales tax on a car that sells for $18,000?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
13000%2F910=18000%2FX
X=%2818000%2F13000%29910
X=%2818%2F13%29910
So the difference is,
X-910=%2818%2F13%29910-910
X-910=910%2818%2F13-1%29
%28X-910%29%2F910=18%2F13-13%2F13
%28X-910%29%2F910=5%2F13
So it is 5%2F13 greater.