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Let the monthly income of Mohan be Rs. '100x' So, rent expense of Mohan = 100x X 0.4 = Rs. '40x' Amount spent on groceries = (100x - 40x) X 0.3 = Rs. '18x' Amount spent on Gym = 40x X 0.25 = Rs. '10x' Amount saved = 100x - 40x - 18x - 10x - 5200 = Rs. (32x - 5200) ATQ; 40x - 32x + 5200 = 10000 Or, 8x = 4800 So, x = 600 So, income of Mohan = 600 X 100 = Rs. 60,000