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 successive percentage increase .
To solve this question, you need to find the net percentage change in the final selling price of a product after a markup and a discount. First, calculate the new selling price after the markup and then the final selling price after the discount. Finally, calculate the net percentage change in the selling price as compared to the original cost price.
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.
Estimate
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\\%\\)
calculate the 10% by dividing by 10 and repeat the process 3 times.
when half of 20 is added to it, it becomes 30.
Evaluate
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.
% decrease
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