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To find the average of a set of numbers, you add all the numbers together and then divide by the total count of numbers. In this case, the sum of 350, 550, and 750 is 1650. To find the average, you divide 1650 by 3 (the total count of numbers), which equals 550. Therefore, the average of 350, 550, and 750 is 550.
150.... 350 / 7 = 50.... 550 x 3 = 150.
550 + 550 = 1100
30% off $550 = $385= $550 - (30% * $550)= $550 - (0.30 * $550)= $550 - $165= $385
60% of 550= 60% * 550= 0.6 * 550= 330