A man purchased a cow for Rs. 3000 and sold it the same day for Rs. 3600, allowing the buyer a credit of 2 years. If the rate of interest be 10% per annum, then the man has a gain of: A. 0% B. 5% C. 7.5% D. 10%

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How many perfect cubes can you find from 1 to 100? How many from -100 to 100?