I need help on these math questions.

Multiply. write your answer in simplest form. 3/8 x 5/7

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax