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Which single discount will be equal to two successive discounts of 20% and 10% ?

 

 

 

pls make it soo easy I have no idea about this!

rosala  Mar 3, 2015

Best Answer 

 #5
avatar+93038 
+10

OK.....just use this

1 - (.80)(.90) = .28 = 28%

{Prove this for yourself}

 

CPhill  Mar 3, 2015
 #1
avatar
+10

OK, let's assume that you startd with $100.

The first discount of 20% is $20, leaving you with $80.

The next discount of 10% (of $80) is $8, for a total discount of $28.

This could have been achieved with one discount of 28%

Guest Mar 3, 2015
 #2
avatar+11852 
0

What are you talking about? This is so hard I don't understand at all!:(

rosala  Mar 3, 2015
 #3
avatar+93038 
+10

Let's look at it this way, rosala....

Something costs $1 but you have a 20% discount.....so  20%  of $1 is .20

So far....we would pay ......  $1  - .20   = .80

Now....let's apply the second discount.....this is 10% of .80

And 10% of .80   = .08

So.....this means that we get .08 off of .80  = .80 - .08  = .72

Now, notice that the total discount is .20 + .08 =  .28.......which is just 28% of one dollar

So....we got a total discount of 28%

 

Does that help??

 

CPhill  Mar 3, 2015
 #4
avatar+11852 
0

It does but... How do I write it in the exam! I can't write it in an explaining way.... I will have to write it in. A practical way!

rosala  Mar 3, 2015
 #5
avatar+93038 
+10
Best Answer

OK.....just use this

1 - (.80)(.90) = .28 = 28%

{Prove this for yourself}

 

CPhill  Mar 3, 2015
 #6
avatar+11852 
0

Ok ! bye!:)

rosala  Mar 3, 2015

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