a shopkeeper buys 12 kg tea of one quality at the rate of rs 250 per kg and 18 kg tea of another quality at the rate of rs 300 per kg. he mixes them and sells at the rate of rs 290 per kg. find his gain or loss per cent
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12kg @ 250/kg = 3000
18 kg @ 300/kg = 5400
total = 30 kg = 8400
he sells it @ of 290Rs per kg = 290× 30 = 8700
he gain 8700 - 8400 = 300 Rs.
percent = 300/8400 × 100 = 3.57 %
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