Last year there was 1,435 8th grade students enrolled at your school. this year there are 1,220. what is the percent change in number of 8th grade students?

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years