Associative law multiplication

In a warehouse, you obtain a 20% discount but you must pay a 15% sales tax. Which would you prefer to have calculated first: discount or tax? Explain. (result write as: 1 = first discount, 2 = first tax, 3 = no matter what first)

Correct result:

x =  3

Solution:

p=1000 a1=p (120/100) (1+15/100)=1000 (120/100) (1+15/100)=920 a2=p (1+15/100) (120/100)=1000 (1+15/100) (120/100)=920  a1=a2  x=3



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(2 - 3)4(4) - 9 ÷ 3

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