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#3 Help.

 Feb 7, 2018
 #1
avatar+103915 
+1

1st  way....note that a 15% discount  is the same thing as multiplying  by .85

 

Take 5 dollars off the original price = p -5

 

Take a 15% discount on this  = (p - 5) .85

 

(p - 5).85   =  .85p - 5(.85)  =   .85p - 4.25  = final price  (1)

 

Second way

 

Apply the discount   .....then the coupon

 

.85p  - 5  = final price  (2)

 

If you can see this .....subtract (2) from (1)....so we have

 

.85p  - 4.25  -  ( .85p - 5)

 

-4.25  + 5  = 

 

$ [ 5 - 4.25]  = 

 

$.75  more

 

 

cool cool cool

 Feb 7, 2018

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