Observe the table below and answer the following question:

Year	Population	Consumption of electricity (GW)
2015	20	25
2016	30	40
2017	40	60
2018	50	80
2019	60	100

1 GW = 100 Million Watt

Population in Million

By what percentage did the consumption of electricity increase from 2015 to 2019?

Correct option is A

Formula Used:
​$$\text{Percentage Increase} = \left( \frac{\text{2019 Year Value} - \text{2015 Year Value}}{\text{2015 Year Value}} \right) \times 100$$​
Solution:
Value of electricity consumption in 2015 = 25 GW
Value of electricity consumption in 2019 = 100 GW
From 2015 to 2019 =  $$\left( \frac{100 - 25}{25} \right) \times 100 = 300\%$$​​