1. Restate the question so you confirm that everyone is on the same page 2. Ask the consultant how does he prefear to "quantify" the "How much" question: A) Number of plastic parts or B) total weight of plastic parts C) Weight percentage of the total car weight.. 3. Try to visualize a car in you head then divide a blank sheet of paper and begin to LIST internal and external plastic parts making assumption about their weight... 4. Sum up and give the answer to the consultant 5. Just in case you want to know other components we can make the same with fabric, glass, rubber and metal maybe as percentage of the total car weight. eg. metal. 60%... plastic 20&... glass 15%.. fabric 5%--