Sam's employer has promised him a 20% pay increase. He presently earns $5 per hour. What will be his new hourly pay after the increase? There were 75 members of the Drama Club last year, but there are only members this year. What is the percent of decrease?

Carlos works at a computer store.
He earns a 4%commission on all of his sales What amount must he sell to earn a commission of $200?