# For which time intervals, is the percentage rise of population the same for the following data?

(a) 1970-80 and 1980-90

(b) 1980-90 and 1990-2000

(c) 2000-2010 and 1990-2000

(d) 1980-90 and 2000-2010

**Answer: (b) 1980 – 90 and 1990 – 2000**

(b) 1980-90 and 1990-2000

(c) 2000-2010 and 1990-2000

(d) 1980-90 and 2000-2010

**Answer: (b) 1980 – 90 and 1990 – 2000**