The number of students in a school decreased from 1600 students in the year 2017 to 1520 students in the year 2018. Calculate the index number to show the change in the number of students in they year 2018 based on the year 2017.

The production of health food in the year 2020 is 11 151 boxes. If the production index of the health food in the year 2020 based on year 2017 is 135 , find the total production of the health food in the year 2017.

The price index for a kilogram of garlic in the year 2016 based on the year 2014 is 115. If the kilogram of the garlic in the year 2014 is RM7.00 , find the price per kilogram of the garlic in the year 2016.

Based on the year 1995, the index number of an oven for the years 1998 and 2001 are 110 and 130 respectively. Find the index number for the year 2001 based on the year 1998.

Price index of one kilogram of three types of fruits sold in a stall in the year 2018 based on the year 2010 was 175, 120 and 160 respectively. Find the composite index of these fruits in the year 2018 based on the year 2010.

The production quantity index for three item X,Y and Z in the year 2020 based on the year 2010 is 110 ,120 and 80 respectively with the ratio of 3:2:5 . Calculate the composite index for all three items in the year 2020 based on the year 2010.

Calculate the value of y.

The above table shows the price indices of a few types of products made by a factory for the year 2008 based on the year 2004 and their respective weightage. If the composite index for the year 2008 based on the year 2004 is 111.5, find the value of x.