Can I have some help with these questions, I'm not sure what to do or the first step... Some help would be appreciated!

1. If the price index for 1984 is 1.00, and today the price index is 1.89, by what percentage have prices risen since 1984? 2. If the price index for 2000 is 1.78 and the price index for 2006 is 1.95, by what percentage have prices risen since 2000? 3. If the price level rose by 3.4% since last year, and last year's price level was 121, what is this year's price level