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Mr Dass wants to invest 12000 in Public Provident Fund (PPF) and inNational bonds. He has to invest at least 1000 in PPF and at least 2000 in bonds. If the rate of interest on PPF is 12% per annum and that on bondsis 15% per annum, how should he invest the money to earn maximum annual income? Also find the maximum annual income.

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Correct Answer - Rs. 1000 in PPF and Rs. 11000 in bonds; Rs.1770
Maximize `Z=(12x)/(100)+(15y)/(100)"subject to"x ge1000, y ge2000, x+yle12000.`

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