The following table shows the gross turnover (in crores) of a company over 5 years.

Year	Gross Turnover
2016	12
2017	18
2018	25
2019	25
2020	30

By what percentage is the gross turnover of 2020 higher than the gross turnover of 2018?

The correct answer is 20%.

From the given table, we can observe the gross turnover (in crores) for the specified years:
- Gross Turnover in 2018 = 25 crores
- Gross Turnover in 2020 = 30 crores

To find the percentage by which the gross turnover of 2020 is higher than that of 2018, we first calculate the difference in turnover between 2020 and 2018.

$\text{Increase in Turnover}=\text{Gross Turnover (2020)}-\text{Gross Turnover (2018)}$

$\text{Increase in Turnover}=30-25=5\text{crores}$

Next, we calculate the percentage increase relative to the gross turnover of 2018 using the formula:

$\text{Percentage Increase}=\left(\frac{\text{Increase in Turnover}}{\text{Gross Turnover in 2018}}\right)\times 100$

Substituting the values into the formula:

$\text{Percentage Increase}=\left(\frac{5}{25}\right)\times 100$

$\text{Percentage Increase}=0.2\times 100=20\%$

Therefore, the gross turnover of 2020 is 20% higher than the gross turnover of 2018.