The indices for the year 1985 with 1975 as the base year were as follows : Year : 1975 1980 1985 Indices : 100 150 200 The indices for the year 1990 with 1985 as the base year were as follows : Year :...

Extracted text: The indices for the year 1985 with 1975 as the base year were as follows : Year : 1975 1980 1985 Indices : 100 150 200 The indices for the year 1990 with 1985 as the base year were as follows : Year : 1985 1990 Indices : 100 120 During the year 1998 the indices with 1990 as the base year were calculated as under : Year: 1990 1995 1998 Indices : 100 150 170 Construct the continuous series of index numbers with base 1990 through backward splicing of the three series.