A) a local shoe store buys shoes at a wholesale price and then marks them up 80% to calculate the retail price. the wholesale price varies, depending on the quantity of shoes purchased. (2 points) quantity 0-20 pairs 21-40 pairs 41-60 pairs 61-80 pairs 81 or more pairs wholesale price (per pair) $25.00 each $23.00 each $21.00 each $19.00 each $17.00 each write an equation that could be used to find the retail price for each range. how do you know the equation will work consistently for each range?

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

step-by-step explanation:

you divide the denominator by the numerator on both sides and if the quotients are equal then the fractions are equivalent