a) To find amount collected in each category - you must understand that the numbers inside the circle represent an angle (in units of degrees). Since we know a circle is composed of 360 degrees, we know each other portions as a ratio of that full circle
for simplicity sake, i will use "d" to represent "degrees"
Shirts = (140d)/(360d)*($7200) = $2800
Pants = (80d)/(360d)*($7200) = $1600
Other = (75d)/(360d)*($7200) = $1500
Shoes = (360d - 140d - 80d - 75d)/(360d)*($7200) = $1300
Total = $7200 [OK]
b) Knowing long sleeve shirts are to be 1/4 of the shirts sales, find the angle which represents in on the pie graph:
angle (long sleeve shirts) = 1/4*(140d) = 35d
c) Assuming ratios to maintain over the next $900 of sales
Pant sales (in the next $900 of total sales) = ($900)*(80d/360) = $200
hope that helps
