+0

# Help help

0
326
6
+11847

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

rosala  Mar 3, 2015

#5
+85677
+10

OK.....just use this

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

{Prove this for yourself}

CPhill  Mar 3, 2015
Sort:

#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
+11847
0

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

rosala  Mar 3, 2015
#3
+85677
+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
+11847
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
+85677
+10

OK.....just use this

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

{Prove this for yourself}

CPhill  Mar 3, 2015
#6
+11847
0

Ok ! bye!:)

rosala  Mar 3, 2015

### 15 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details