IGCSE /Grade 10
Maths MCQ Based On Change percentage
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IGCSE Grade 10 Maths Change percentage
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calculate the final value and measure the change over 100.
calculate the successive percentage increase .
Estimate
calculate the quantitiy of water in the mixture and compare the percentage .
assume length as 'l' and breadth as 'b' and use the given percentages
Evaluate
Estimate
You can use the formula for successive percentage change to solve this problem.
Let P be the original price of the shirt. After the price is increased by 25%, the new price becomes 1.25P. After the price is decreased by 20%, the new price becomes 0.8(1.25P).
You can then use the formula for successive percentage change to calculate the net percentage change in the price of the shirt.
First, find the new length and breadth of the rectangle after a change of 10% in both dimensions.
Then use the formula for the perimeter of a rectangle to calculate the original and new perimeters.
Finally, use the percentage change formula to find the net percentage change in the perimeter of the rectangle.
The difference between the two values is:
\\(5x-\\frac{x}{5}=\\frac{25}{5}x-\\frac{x}{5}=\\frac{24}{5}x\\)
So the percentage change is:
\\([(\\frac{24}{5}x)\\div x]\\times100\\%=480\\%\\)
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