Let the income of Bimla be Rs. 100 Amla's income =1.2*100= Rs. 120 Also, Amla's income =
4
5
× Kamla's income Therefore, Kamla's income =
5
4
×120= Rs. 150 Kamala's new income with 4% decrease =0.96×150= Rs. 144 Bimla's new income with 10% increase =1.1×100= Rs. 110 Required percentage increase =(