Question
If number ‘n’ is increased by 25%, then it is decreased by 20%. What is the net percentage change in the value of n? [3 MARKS]
Answer:
:
Formula: 1Mark
Steps: 1Mark
Answer: 1Mark
Given,
The number 'n' is first increased by 25%.
25
So, the new value of n
=n+n×25100=n×54
Now, the value of is again decreased by 20.
So, 20of the new value
=n×54×20100=n×14
So, the new value
=n×54 - n×14=n
Net percent change
=amount changedoriginal value×100
Net change = n - n = 0.
So on substituting the values we get:
Percent change = 0n×100 = 0
So, there is no percentage change.
Was this answer helpful ?
:
Formula: 1Mark
Steps: 1Mark
Answer: 1Mark
Given,
The number 'n' is first increased by 25%.
25
So, the new value of n
=n+n×25100=n×54
Now, the value of is again decreased by 20.
So, 20of the new value
=n×54×20100=n×14
So, the new value
=n×54 - n×14=n
Net percent change
=amount changedoriginal value×100
Net change = n - n = 0.
So on substituting the values we get:
Percent change = 0n×100 = 0
So, there is no percentage change.
Was this answer helpful ?
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