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# Help help

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

rosala  Mar 3, 2015

#5
+93038
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OK.....just use this

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

{Prove this for yourself}

CPhill  Mar 3, 2015
#1
+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
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What are you talking about? This is so hard I don't understand at all!:(

rosala  Mar 3, 2015
#3
+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
+11852
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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
+93038
+10

OK.....just use this

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

{Prove this for yourself}

CPhill  Mar 3, 2015
#6
+11852
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Ok ! bye!:)

rosala  Mar 3, 2015