Determine whether each statement is always true sometimes true or never true

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours