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Kanja invested sh. 15 000 at r% per annum and sh 20 000 at s% per annum both simple interest. His investments earned him a total of sh. 11 400 after three years. If he had invested all his money at the average rate (#(r+s)/2#)% per annum simple interest, his investment would have earned him sh. 150 more
than it did. Determine the values of r and s.