The number x of bicycle helmets a retail chain is willing to sell per week at a price of p is given by x 81 p 9 300 20 ps 100 Complete parts A and B Supply Demand 800 700 600 500 400 300 200 100 to 0 X X1000 491p 9 x 81p 9 300 N 0 20 40 60 80 100 120 Price Dollars A Find dx dp dx dp B Find the supply and the instantaneous rate of change of supply with respect to price when the price is 91 Interpret your results When the price is 91 the supply is When the price is 91 the instantaneous rate of change of supply with respect to price is At a price of 91 the supply is bicycle helmets per week and supply i at a rate of bicycle helmets per dollar