Gia bought a computer that was 20% off the regular price of $1,280. If a 9% sales tax was added to the cost of the computer, what was the total price Gia paid for it?

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

How do i do this activity, is appreciated

Can anyone me with 32,33,36,37,and 40.