The following table contains financial information for trumpeter inc. before closing entries:
cash $12,200
supplies 6,200
prepaid rent 3,800
salary expense 4,900
equipment 66,600
service revenue 29,700
miscellaneous expenses 20,300
dividends 3,600
accounts payable 4,200
common stock 67,400
retained earnings 16,300
what is trumpeter's net income?
$4,500

Four key marketing decision variables are price (p), advertising (a), transportation (t), and product quality (q). consumer demand (d) is influenced by these variables. the simplest model for describing demand in terms of these variables is: d = k – pp + aa + tt + qq where k, p, a, t, and q are constants. discuss the assumptions of this model. specifically, how does each variable affect demand? how do the variables influence each other? what limitations might this model have? how can it be improved?