Let x be the salary. The amount left after 10 % deduction in tax is 0.9x. Then he spends 16% of 0.9x on education, then the amount left is 0.9x - 0.16 x 0.9x=0.756x. Now 70% of 0.756x is spend on house rent. So the amount left is (1-0.7)0.756x=0.2268x. And given 0.2268x=5670
x=5670/0.2268=25000. So the total salary of Raju is rupees 25000