20. A shopkeeper bought locks at the rate of 8 locks for 34 and sold them at the rate of 12 locks for 57.
Calculate:
(1) his gain per cent, and
(11) the number of locks he should sell to earn a profit of 45.
(Hint. Let the number of locks bought be the LCM of 8 and 12)
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Step-by-step explanation:
34×8=272
272+12=282
LCM=24
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