Record the following journal entries:

a. Purchased equipment by paying $4,000 cash and executing a note payable for $4,000 on August 4th.

b. Edward Wilson invested $15,000 cash in his new landscaping business on August 1.

c. Billed clients for a total of $7,000 for design services rendered on August 22nd

d. Received $1,000 cash from clients for services rendered above on August 29th.