Andrea Conaway opened Wonderland Photography on January 1 of the current year. During January, the following transactions occurred and were recorded in the company's books:
1. Conaway invested 20,000 of photography equipment to the business.
3. The company paid 5,700 cash for services provided during January.
5. The company purchased 2,750 of services to customers on account.
7. The company paid cash of 3,100 on the office equipment purchased in transaction #5 above.
9. Paid 31,400. B、31,150. D、30,875.