Average sales of Product C — Aptitude Question
Average sales of Product C: | Year | Product A | Product B | Product C | Total |… Answer and worked solution on CodeKairo.
- Topic: Tables & Charts
- Section: Data Interpretation
- Difficulty: Easy
- Time target: 50 seconds
Question
| Year | Product A | Product B | Product C | Total |
|---|---|---|---|---|
| 2022 | 120 | 180 | 100 | 400 |
| 2023 | 150 | 200 | 130 | 480 |
| 2024 | 210 | 190 | 200 | 600 |
| 2025 | 240 | 260 | 250 | 750 |
What were the average annual sales of Product C over the four years?
Options
- 160
- 170
- 180
- 195
Show the answer and the worked solution
Correct answer: B. 170
Worked solution
- Product C: 100 + 130 + 200 + 250 = 680.
- Average = 680 / 4 = 170.
Answer: 170.
The idea
Read down the single column the question names and ignore the rest of the table. Most reading errors in data interpretation are picking up a neighbouring column.
Shortcut. Take 150 as a base: the deviations −50, −20, +50 and +100 add to +80, and 80 ÷ 4 = 20, so the average is 150 + 20 = 170.
Common trap. 180 is Product A's average (720 ÷ 4) — the result of reading down the neighbouring column instead of Product C.