What is the approximate difference between the average sales turnover of all…

Concept: When the same fixed number of entities (here, 5 companies) is compared across two periods, the difference between the two periods' group averages equals the difference between their group totals divided by that same count — Average1 − Average2 = (Total1 − Total2) / n. So the two averages never need to be found separately; only the two totals and their gap matter.

Application: Read every bar against the value axis (gridlines at every 200 crore) and combine the five companies for each year separately:

1. Sum the five 2001-2002 bars (per the chart's legend): Honda (≈1110) + GM (≈905) + Maruti (≈670) + Hindustan Motors (≈1160) + Hyundai (≈945) ≈ 4790 crore.

2. Sum the five 2002-2003 bars: Honda (≈835) + GM (≈740) + Maruti (≈720) + Hindustan Motors (≈1075) + Hyundai (≈705) ≈ 4075 crore.

3. Subtract the 2002-2003 total from the 2001-2002 total to get the combined year-on-year gap: 4790 − 4075 ≈ 715 crore.

4. Divide this combined gap by 5 (the number of companies) to get the average difference asked for: 715 ÷ 5 ≈ 143 crore.

Cross-check: Reading bar heights off a graph is inherently approximate, but the same result must also come out if each company's own year-on-year change is found first and those five changes are then averaged — since averaging five differences is mathematically identical to differencing two totals divided by the same 5. Either route lands close to the same figure, confirming the reading is consistent rather than a one-off misread.

This works out closest to 142.48 crore among the given choices, which is why that option is correct.