Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 740

If 450 is first increased by 10% and then decreased by 15% , Then the resulting number is?

M.M.Zeeshan.K

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,889

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 is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 740

Ok! The difference between these two

M.M.Zeeshan.K

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,889

Hi,

The difference between the two : 427.50 - 420.75 = 6.75.

This can be calculated with any hand held calculator.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 740

Not this difference , Means the difference between methods and when to use

M.M.Zeeshan.K

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 28,889

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 is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

Pages: **1**