$1.$ January $1$: ABC Consulting started the business with an initial investment of $$10,000$ in cash.

$2.$ January $3$: Provided consulting services to Client A for $$2,000$ in cash.

$3.$ January $5$: Purchased office supplies on account for $$500.$

$4.$ January $8$: Received $$1,500$ from Client B for services to be provided in the future.

$5.$ January $12$: Paid $$200$ for utilities.

$6.$ January $15$: Completed a consulting project for Client C and billed them $$3,000,$ to be paid later.

$7.$ January $20$: Paid $$300$ towards the office supplies purchased on January $5.$

$8.$ January $25$: Received a bill for internet services for the month, amounting to $$100.$ Payment is due next month.

$9.$ January $30$: Collected $$2,800$ from Client C for the services provided on January $15$