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Answer :
Given the dimensions of the John's room, the cost of painting the room would be $14.
What is the cost of painting the room?
The first step is to determine the total area of the room.
Area of the ceiling = 14 x 9 = 126 ft²
Area of the four walls = (2 x 14 x 7) + (2 x 9 x 7) = 322 ft²
Total area of the room = 126 + 322 = 448 ft²
The second step is to subtract the areas of the door and windows from the area of the room.
Area of the door = 6 x 3 = 18 ft²
Area of the two windows = 2 x (5 x 42/12) = 35 ft²
Area of the room excluding the areas of the door and the windows = 448 - 35 - 18 = 395 ft²
Number of quarts needed = 395 / 100 = 3.95 quarts = 4 quarts
Cost of 4 quarts = 4 x 3.5 = $14
To learn more about how to calculate the area of a rectangle, please check: https://brainly.com/question/16595449
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