If the simple interest on $7000 for 8 years is $4480, then what is the interest rate ?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

The measure of an angle is 117°. what is the measure of a supplementary angle?

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