It costs charlie’s car repair shop $27 to change the oil. the shop charges their customers $40 for an oil change. what is the percent of markup in the cost of an oil change?

18.1%

Step-by-step explanation:

The markup is the difference that exists between the price that a product had and its "real" price as a percentage of the cost. This markup is what brings profit to a seller.

In this example the cost of changing the oil to the shop is $27. However, the oil change is sold to people at $40. This means that there is a difference of:

40 - 27 = 13

$13 represents 48.1% of $27, which means that the percent of markup is 48.1%

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

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step-by-step explanation: