A radio sold for 5670 at a loss of 12%. Calculate the cost price

$773.18

Step-by-step explanation:

Revenue=Cost 1−Gross Margin

Revenue=5,670.001−0.1200

Revenue=6,443.18

Gross Profit=Revenue×Gross Margin

Gross Profit=6,443.18×0.1200

Gross Profit=773.18

Mark Up=Gross ProfitCost×100

Mark Up=773.185,670.00×100

Mark Up=13.64%

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.

here is your mark brainliest