Tax=tax rate times cost of product
tax=17.50
cost of product=250
17.50=rate times 250
divide both sides by 250
17.50/250=rate
0.07=rate
percent means parts out of 100
0.07/1 times 100/100=7/100=7%
7%=rate
answer is 7% tax
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Subtract sides 2x


Divide sides by 3


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CHECK :




So the value is correct.
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The probability is 34% because 9/26=.34615384615. The first 2 numbers makes the percentage
The area of the triangle is 12.72unit