Number of registered cars in four cities A–D (2017–2020) and their 2020 population (millions).

City	2017	2018	2019	2020	Population (million)
A	7500	8000	9000	9500	0.8
B	1200	1350	1400	1500	0.2
C	6000	7500	8500	10000	0.6
D	5000	6000	6600	7400	0.75

What is the average of percentage growth in registered cars across all the cities from the year 2017 to the year 2018?

AAbout 18%

BAbout 16% ✓ Correct

CAbout 14%

DAbout 12%

Correct answer: (B) About 16%

Explanation

The percentage growth from 2017 to 2018 across all cities is about 16 percent.

The total registered cars in all cities in 2017 add up to 19700.

The total in 2018 adds up to 22850.

The increase is 22850 minus 19700, which is 3150.

The percentage growth is 3150 divided by 19700 times 100.

This is about 15.99 percent, roughly 16 percent.

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