The population of a variety of tiny bush in an experimental field increased by 10% in the first year, increased by 8% in the second year but decreased by 10% in the third year. If the present number of bushes in the experimental field is 26730, then the number of bushes in the beginning was :

From a container having pure milk, 20% is replaced by water and the process is repeated thrice. At the end of the third operation, the milk is :

How much $$66\frac{2}{3}$$% of Rs. 312 exceeds Rs. 200 ?

Find the number : 125% of 3060 - 85% of (?) = 408

David and his wife each receives an 8 percent annual rise. If David receives a raise of Rs. 800 and his wife receives a raise of Rs. 840, what is the difference between their annual incomes after their raises ?

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