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a $100 suit is on sale for 30% 0ff. You present a coupon for an additonal 20% off .

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4 Answers

( 1 - 0.30 ) 100 =$ 70  sales price
 
  ( 1- 0.20 ) $70 = 0.80 ( $70) = 56 
 
  
 30% sells for %70 of the original price , and 20% coupon will sell for 80% of discounted price.
 
   So :
 
   $100 * 0.70 * 0.80 = $ 56  / one line solution. 
Oliva,
We can solve also like this
 
100(.30)= 30 
100-30= 70 
 
Now again 20% on $70 
 
70(.20)=14
70-14=56
The decay factors are (1-30/100) and (1-20/100), where 30/100 and 20/100 stands for the actual percentages that are taken off of the initial price. 
 
Therefore, the final price will be $100*(1-.30)*(1-.20)=$56 dollars. 
 
Multiplying by (1-.20) after we've already calculated $100*(1-.30) assures that the coupon will be applied on the already reduced price.
Olivia,
 
        the price of the suit = $100(1-.3)*(1-.2) = $100*.7*.8=$56.00. Notice that the total % (56)is a little larger than the sum of the percents off (30+20=50).
 
Jim