Net income was $520,000 in 2018, $431,600 in 2019, and $513,604 in 2020. What is the percentage of change from (a) 2018 to 2019, and (b) from 2019 to 2020? Is the change an increase or a decrease? (Enter negative amounts using either a negative sign preceding the number e.g. -45 or parentheses e.g. (45). Round percentages to 1 decimal place, e.g. 12.3%.) Increase or (Decrease) Amount Percentage (a) 2018-2019 T(78,000 15% (b) 2019-2020 49% 75,140