8. The cost of a fleece blanket is $26, and it sells for $50. Find the percent of markup on cost and selling price. O A 48% markup on cost is equivalent to a 92% markup on selling price.
An 81% markup on cost is equivalent to a 19% markup on selling price.
A 52% markup on cost is equivalent to a 19% markup on selling price.
A 92% markup on cost is equivalent to a 48% markup on selling price.

A 52% markup on cost is equivalent to a 19% markup on selling price.

Step-by-step explanation:

3. parallelogram

step-by-step explanation:

we turn each of our sides into direction vectors

ab=b-a=(3 - 7, 1 - 0) = (-4, 1)

bc=c-b=(1,6)

cd=d-c=(4,-1)

da=a-d=(-1,-6)

we see how the opposite sides have negated direction vectors; this is characteristic of a parallelogram.   we have congruent sides ab=cd and bc=da with unequal lengths because 1^2+6^2 is different from (-4)^2+1^2.   so it's not a square or a rhombus.  

we check the dot product of direction vectors of adjacent sides.   we have

ab dot bc = -4(1) + 1(6) = 2

that's not zero so the sides are not perpendicular.   we've ruled out rectangle.

the direction vectors indicate two pairs of congruent parallel sides, so we choose parallelogram over trapezoid.

not sure but it may be b, as i said i'm not sure.