Answer:
6 is your median and the average is 11.7
Step-by-step explanation:
to find the median, you simply list the numbers in order from greatest to least and determine which is in the middle.
(3, 4, 5, 6, 16, 20, 28 - with 6 there is three numbers on the left and three numbers on the right)
to determine the average, you add all the numbers up and divide by how many numbers you have
3 + 4 + 5 + 6 + 16 + 20 + 28 = 82
82 divided by 7 is 11.71428571 (when simplified its 11.7)
keeping in mind that parallel lines have exactly the same slope, let's check for the slope of the equation above

so we're really looking for the equation of a line whose slope is 1/2 and passes through the point (2 , -6)

Ten thousands place
just think of 100 and 10
17% of 19,700 = 3349. So if you add 3349 to 19,700 you get 23,049. So it sounds like it's around a 16-17% markup.