So the numbers i have are different from the ones in here could someone help me with the answer. Below is what my problem is and you can see how it is different

a.	Paid $6,000 cash in advance on April 1 for a one-year insurance policy.
b.	Purchased $2,400 of supplies on account. At years end, $200 of supplies remained on hand.
c.	Paid $7,200 cash in advance on March 1 for a one-year lease on office space.
d.	Received an $18,000 cash advance for a contract to provide services in the future. The contract required a one-year commitment starting September 1.