If a data table shows revenue of 100, 150, 210, 270 over four quarters, what is the approximate average quarterly increase?

If a data table shows revenue of 100, 150, 210, 270 over four quarters, what is the approximate average quarterly increase?

• A. 50
• B. 56.7
• C. 60
• D. 70

Answer: (B)

Think in terms of how much revenue grows on average each quarter. Look at how much the revenue increases from one quarter to the next: 150 minus 100 is 50, 210 minus 150 is 60, and 270 minus 210 is 60. The three quarterly increases are 50, 60, and 60. Average these: (50 + 60 + 60) / 3 = 170 / 3 ≈ 56.7. So the approximate average quarterly increase is about 56.7 units of revenue per quarter. This also matches calculating the total change from start to end divided by the number of increases: (270 − 100) / 3 ≈ 56.7.

Think in terms of how much revenue grows on average each quarter. Look at how much the revenue increases from one quarter to the next: 150 minus 100 is 50, 210 minus 150 is 60, and 270 minus 210 is 60. The three quarterly increases are 50, 60, and 60. Average these: (50 + 60 + 60) / 3 = 170 / 3 ≈ 56.7. So the approximate average quarterly increase is about 56.7 units of revenue per quarter. This also matches calculating the total change from start to end divided by the number of increases: (270 − 100) / 3 ≈ 56.7.