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secondary 4 | E Maths
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How to do the whole of question 9. I don’t understand at all... :(
Date Posted: 4 years ago
Views: 257
(a)
Let the cost of his goods be 100 units.
New price after the raise = 110 units
Price after discount = 90% of 110 units = 99 units
Overall discount
= 1 unit out of 100 units (based on the old price)
= 1%
(b)
Let the length of the rectangle be 10 units and the breadth of the rectangle be 10 parts.
Old area = 10 units x 10 parts = 100 units-parts
New length = 12 units
New breadth = 8 parts
New area = 12 units x 8 parts = 96 units-parts
This is a decrease of 4% of the original area.
(c)
Let the length of the rectangle be 10 units and the breadth of the rectangle be 10 parts.
Old area = 10 units x 10 parts = 100 units-parts
New length = 12 units
Since the area remains unchanged,
New breadth
= 100 units-parts / 12 units
= 8.33333333333333... parts
This is a 16.66666666666...% decrease in the breadth, or 16.7%.
Let the cost of his goods be 100 units.
New price after the raise = 110 units
Price after discount = 90% of 110 units = 99 units
Overall discount
= 1 unit out of 100 units (based on the old price)
= 1%
(b)
Let the length of the rectangle be 10 units and the breadth of the rectangle be 10 parts.
Old area = 10 units x 10 parts = 100 units-parts
New length = 12 units
New breadth = 8 parts
New area = 12 units x 8 parts = 96 units-parts
This is a decrease of 4% of the original area.
(c)
Let the length of the rectangle be 10 units and the breadth of the rectangle be 10 parts.
Old area = 10 units x 10 parts = 100 units-parts
New length = 12 units
Since the area remains unchanged,
New breadth
= 100 units-parts / 12 units
= 8.33333333333333... parts
This is a 16.66666666666...% decrease in the breadth, or 16.7%.
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Date Posted:
4 years ago
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