In which year did the prices of all three products increase compared with the…
2010
In which year did the prices of all three products increase compared with the previous year?
Answer: B. 2002 — ConceptTo test whether several series increased in a given year, compare each current-year value with the same series in the immediately preceding year. For…
- A.
2000
- B.
2002
- C.
2003
- D.
2006
Show answer & explanation
Correct answer: B
Concept
To test whether several series increased in a given year, compare each current-year value with the same series in the immediately preceding year.
For every product, compute the year-on-year change as current value minus previous value. All products increased only when every change is positive.
Application
Read the 2001 and 2002 values from the line graph: plywood changes from 3 to 4, saw timber from 10 to 12, and logs from 19 to 21.
The three changes are 4 − 3 = 1, 12 − 10 = 2, and 21 − 19 = 2. Each change is positive.
Therefore, all three product prices increased in 2002 compared with 2001.
Year | Plywood | Saw timber | Logs |
|---|---|---|---|
2001 | 3 | 10 | 19 |
2002 | 4 | 12 | 21 |
Change | +1 | +2 | +2 |
Cross-check
For 2003, saw timber and logs decrease; for 2006, logs remain at 21; and 2000 has no preceding year shown. None of these alternatives has three positive changes.
Hence, the required year is 2002.