What is the correct answer can you guys me i really need on this? ?

What can you determine about the solutions of this system

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.

What percent of 18 is 24? and plz explain thx.