John opened AP Company on January $1$ of $2018.$ During January, the following transactions occurred and were recorded in the company's books:

a$.$ John invested $$15,000$ cash in the business.

b$.$ The company received $$6,000$ cash for services provided during January.

c$.$ The company purchased $$5,000$ of supplies on credit.

d$.$ The company paid $$3,000$ on the supplies purchased in transaction #c above.

e$.$ The company borrowed cash from First National Bank by issuing a $$4,000,90-$day, $15\%$ note to the bank.

Based on this information, please use the accounting equation to record the above transactions.