Bina's monthly income is 90% of Anita's monthly income. The total of both their monthly income is Mr. Sen's monthly income. Mr. Sen's annul income is ₹ 775200. What is Bina's monthly income?

Mr. Sen's monthly income
= (Bina + Anita)'s monthly income = 775200/12 = ₹ 64600
According to the question.
Bina's monthly income = 90% of Anita's monthly income
⇒ Bina/Anita = 90/100 = 9 /10
⇒ Bina : Anita = 9 : 10
∴ Bina's Monthly salary
= (9/19) x 64600
= ₹ 30600