SOLUTION: please help me on this problem. I don't know which catergory this is in,but the problem is. Kayla paid $137.80,including 6% tax for her graphing calculator. How much did the ca

Question 267907: please help me on this problem. I don't know which catergory this is in,but the problem is.
Kayla paid $137.80,including 6% tax for her graphing calculator. How much did the calculator itself cost.
This is my work.
a)variables
b) 100[p-0.06]=[137.80]100

100-6x=13780
-100 -100
-6x=13680
/-6x /-6x
x=
Answer by unlockmath(1688) (Show Source): You can put this solution on YOUR website!
Hello,
Let's set it up this way. Let "p" be the price of the calculator. Then we can write this equation.
p+(6% times p)=$137.80 Rewritten it looks like this:
p+.o6p=137.8 Combine like terms to get:
1.06p=137.8 Divide both sides by 1.06 to get:
p=130
Now we know the calculator cost $130 but check it out for yourself to see when you multiply 130 time 6%. You should get what the tax is, right?
RJ
There is a book on the basics of math you might check out>
www.math-unlock.com
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