what is accounts receivable? what is account payable? what are assets? what are liabilities? what is net worth? what is a sales tally? what do we use sales reports for? what is auditing? what is a profit loss statement? what are the differences between fixed and variable expenses? List three common items included in start up costs. what is COGS? what are operating expenses? describe gross and net income. describe break even point. describe a balance sheet. what is collateral? what is interest? how do you calculate interest? how do you calculate monthly payments for a loan?