SOLUTION: If my total cost of a item is 92.40 inclusive of 9.90 vat how much percent vat is this

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Question 1005701: If my total cost of a item is 92.40 inclusive of 9.90 vat how much percent vat is this
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Let f(x) = sin x.
Find the average rate of change of f from x1 = 5π/4 to x2 = 3π/2
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Ave rate = [f(3pi/2) - f(5pi/4)]/[(3pi/2)-(5pi/4)]
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= [sin(3pi/2) - sin(5pi/4)]/[(12pi-10pi)/(8)]
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= [-1 - -(sqrt(2)/2)] / [pi/4]
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= [-2+sqrt(2)]/2 / (pi/4)
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= 2((-2+sqrt(2))/pi
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= [-4+2sqrt(2)]/pi
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Cheers,
Stan H.
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