In most of the weighted index numbers the weightpertains to: (i) base year(ii) current year(iii) both base and current year

In most of the weighted index numbers the weightpertains to: (i) base

1.	In most of the weighted index numbers the weightpertains to: (i) base year(ii) current year(iii) both base and current year
Answer» ANSWER :(i), as changing the WEIGHT EVERY YEAR is CUMBERSOME.