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Savita buys l kg of darjeeling tea at Rs.x per kg and j kg of assam tea at Rs.y per kg. She mixes the two qualities and sells the mixtures at Rs.z per kg.

Find the expression for his profit percent.


Total amount Spend = i*x + j*y
Total Quantity she buys = i + j
Selling prize = z*(i+j)
profit percent = [z*(i+j)-i*x-j*y]100/(i*x+j*y) 
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