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I dont have ANY IDEA on how to do ANY kind of math problem coz i am not a math student but i have to do some QA questions for my entrance exams so I need a little bit of help here!

so...here's the question:-

The monthly incomes of A and B are in the ratio 8:7 and those of B and C are in the ratio 5:3. If the monthly income of C is Rs.3,360, find the monthly income of A.

Options:

a) Rs.3500

b) Rs.4200

c) Rs.5600

d) Rs.6400

I tried solving the problem and I can't get the answer in more than 3 digits! Desperately need help here!