Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 2018-08-05 15:27:48
- Zeeshan 01
- Member
- Registered: 2016-07-22
- Posts: 746
Increase and decrease in quantity
If 450 is first increased by 10% and then decreased by 15% , Then the resulting number is?
Malik
Offline
#2 2018-08-05 17:13:31
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,406
Re: Increase and decrease in quantity
Hi Zeeshan 01,
450 is increased by 10% : Resulting in 450 + 45 = 495.
Later, it is decreased by 15%.
That is, 495 - (15/100) x 495 = 495 - 74.25 = 420.75.
If the problem is intended : 450 is first increased by 10% and decreased by 15%, the net effect being decrease in 5%;
In this case, the value would be 450 - 450 x 5/100 = 450 - 22.5 = 427.50.
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
Offline
#3 2018-08-05 20:24:19
- Zeeshan 01
- Member
- Registered: 2016-07-22
- Posts: 746
Re: Increase and decrease in quantity
Ok! The difference between these two
Malik
Offline
#4 2018-08-05 23:52:30
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,406
Re: Increase and decrease in quantity
Hi,
The difference between the two : 427.50 - 420.75 = 6.75.
This can be calculated with any hand held calculator.
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
Offline
#5 2018-08-06 03:20:32
- Zeeshan 01
- Member
- Registered: 2016-07-22
- Posts: 746
Re: Increase and decrease in quantity
Not this difference , Means the difference between methods and when to use
Malik
Offline
#6 2018-08-06 13:49:41
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,406
Re: Increase and decrease in quantity
Hi,
The first method is technically correct.
It is always advisable to use this method.
The second method may give more of less the same value.
This is for the beginners.
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
Offline
Pages: 1