Let the radii of the two circles be 16k and 9k respectively. The ratio of the expenditures of the two families is the same as the ratio of the areas of the two respective circles. Expenditure of family A: Expenditure of family
B=π(16k)2:π(9k)2=256:81=25600:8100
Thus, the expenditures of family A and family B are ₹25,600 and ₹8,100 respectively.