can you show the work please?

Sue and Tina start a business. In the first month they invest $12,000 cash in the company. $3,000 is then spent on equipment and $600 on supplies. The women also purchased a large office printer, which cost $800; however, they will not need to pay that bill for two months. What is the owner's equity at the end of Sue and Tina's first month? O $8.400 O $11,200 O $12,000 O $7,600