The answer to the above question is (c). Explanation: When DP | ECONOMY by VIVEK SINGH

The answer to the above question is (c).
Explanation:

When DPIIT started the new series of WPI with base year 2011-12, then it measured/calculated the "Net traded value" of the 697 different items.
Net traded value = Domestic production plus imports minus exports
Net traded value = Domestic production plus Net imports

Imports minus Exports is also called Net Imports.
Exports minus Imports is also called Net Exports.

So, the weights of the 697 different items in the WPI basket is based on "Domestic production of that item plus Net imports" which is also called "Net traded value". And this weight is kept constant. And every month only the price change of 697 different items will be measured in the wholesale mandis/markets and the Index will be calculated. Because it is very cumbersome process to measure the "Net traded Value" every month or year and revise the weights...........and anyway the "Net traded Value"....does not change much year wise in proportion............so weights are kept constant till the revision of base year. Now let us say base year is changed to 2021-22 then again the "Net traded Value" will be measured in 2021-22 and new weights will be assigned.

All the 697 items are divided into three groups

Primary Articles = overall weight 22.62%
Fuel and Power = overall weight 13.15%
Manufactured Products = overall weight 64.23%