What is -7.08 as a fraction

Rewrite the following without an exponent. (5/8)-1

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.

Can someone answer this question for me