Identify the times and money (cash and goods value) paid each time for each
item. For example: with item 01 it is the monthly expenditures for materials in the last 12
months, then in question 2 record the total expenses for material for 1 month; question 3 record
12 times with time unit is 8, or one time with time unit is 5. If respondent has bought many
different materials with different times and periods then the most important thing is to calculate
the total value of all materials bought in the last 12 months under the following regulations:
record to question 2 the total money spent to buy all kinds of materials in the last 12 months;
question 3 record 1 time, time unit record 8 (buy one time in a year).