How do I figure this out?

The following table shows the estimated number of millionaire households (households with a net worth of at least$1 million,not including primary residence) in a certain country for selected years.

Year

Millionaire Households

2015 9,200,000

2016 9,360,000

2017 9,640,000

2018 9,980,000

(a)

What is the percentage increase in the estimated number of millionaire households from 2017 to 2018? Round to the nearest tenth of a percent.

(b)

If the percentage increase between 2017 and 2018 continued for 2018 and 2019, how many millionaire households would there be in 2019? Round to the nearest ten thousand.