Shirley Cosby, an owner, made an additional investment of $20,500 in cash. A firm purchased equipment for $9,900 in cash. A firm sold some surplus office furniture for $1,650 in cash. A firm purchased equipment, a computer, for $3,600, to be paid in 60 days. A firm purchased equipment for $11,100 on credit. The amount is due in 60 days. Jack Walker, owner of Walker Travel Agency, withdrew $5,900 of his original cash investment. A firm bought a delivery truck for $36,500 on credit; payment is due in 90 days. A firm issued a check for $3,400 to a supplier in partial payment of an open account balance