7. Listed below are transactions that typically produce either an increase or a decrease in cash. Indicate by letter whether the cash effect of each transaction is reported on a statement of cash flows as an operating activity (O), investing activity (I), financing activity (F), or none of these (N) Collection of interest payable Merchandise sales for cash Purchase of treasury stock Declaration and payment of a cash dividend Acquisition of an office building for a mortgage payable Purchase of inventory for cash Payment of interest expense Issuance of bonds Acquisition of share of Apple stock as a long-term investment Payment of income taxes