A number is increased by 40%then decreased by 40%.Find the met increase or decrease per cent
Answers
Answer:
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Let us assume that the number be 100. At first we have to increase the number by 40%. Then we have to decrease 40% again.
so, firstly, after increase the term by 40% , we have the number be
100 + 100*40/100
= 100 + 40
= 140
Again, we have to decrease the number by 40%. So, the number becomes
140 - 140*40/100
= 140 - 56
= 84
So, we have seen that the number decrease. Now we have to calculate the percentage of the number has decreased.
Assumed number = 100
Present number = 84
So, decrease percentage = 16 % (ans.)
Answer
Step-by-step explanation:
Let the number = x
the number is increased by 40% = x + x×40/100 = x + x × 2/5 = 7x/5
Now , the number is decreased by 40% = 7x/5 - 7x/5 × 40/100
= 21x/25 = 21×4 x/25×4
= 84x/100
= 84% of x
Finally the number we get in the end is 16% decrease by the original number x .