Respuesta :

[(80-64)/80]*100 expression
[16/80]*100         do the change in price
0.2*100               division
20                       multiply
20%                    add percent sign

Answer:

20%

Step-by-step explanation:

The first step in finding how much the quantity decreased. We do a subtraction:

[tex]80-64=16[/tex]

and now we must know how much percentage is 16 of 80, for this we divide:

[tex]\frac{16}{80}=\frac{1}{5} = 0.2[/tex]

and finally we convert this decimal value to a percentage multiplying by 100%

0.2(100%) = 20%

the quantity decreased by 20%

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