Who is the highest earner?

Not more than 3 persons got less remuneration than Aarti. Aarushi got less Remuneration than Aarti. Remuneration of Aarushi and Aarti together was equal to the Remuneration of Ayushi. As we already know that different amount as remuneration (In Rs.) viz. 2000, 3400, 3500, 4600, 5500, 6000, 11000 and 12000. So the possible amounts of remuneration of Aarti are 4600, 3500 or 3400. From the last hint we can say that, Remunerations of Aarushi + Aarti = Remuneration of Ayushi. So, the only possible combination is 3500 + 3400 = 6000, one of the amounts given. Thus it is clear that Remunerations of Aarushi, Aarti and Ayushi are Rs. 3400, Rs. 3500 and Rs. 6000 respectively. Remuneration of Ayushi, Aarushi and Aarti together were equal to Aashu. This means that remuneration of Aashu is 3500+3400+6000 = 12000 Remuneration of Anjali and Ayushi together were equal to Anika. We already know remuneration of Ayushi as Rs. 6000 and as per the available amounts i.e. 2000, 4600,5500 and 11000. Only 6000 + 5500 makes such combination where remuneration of two persons is equal to the remuneration of the remuneration of third person. So, remuneration of Anjali and Anika is Rs. 5500 and 11000 respectively.