Need steps to solve this: auto sales parts had a decreased of 20.5% this month compared to last month ,if sales this month were $75,366,what were the sales last month?

  $96,008

Step-by-step explanation:

The verbal description of the relationship translates to ...

  (last month's sales) -21.5%×(last month's sales) = $75,366

Simplifying, we have ...

  0.785 × (last month's sales) = $75,366

Dividing by the coefficient of the variable, we find ...

  (last month's sales) = $75,366/0.785 = $96,007.64

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The sales last month were $96,008.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional