For producing 1000 pizza, 20 labour hour, 800 kg material and $1000 capital cost are needed. Labour hour rate is $40 per hour and material cost is $4 per kg. Due to some customer complaints the store manger has decided to change the material which will increase the material cost by 15%. How much does the productivity change in percentage? new productivity - old productivity Productivity change(%)= _________________________________________ x 100 old productivity