last year the debate club had 16 members. this year, the club has 10 members. what is the percent of change in the number of club members?

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