In the follwoing distribution - 

the number of families having income in the range Rs. 20,000 -Rs. 25,000 is:

Correct option is A

Cumulative frequency table (more than type)

Formula used:
Number of families in the range ₹20,000 – ₹25,000
= Number of families earning more than ₹20,000
– Number of families earning more than ₹25,000

Solution:
= 69 – 50
= 19

Correct answer is (a)