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0 / 60 seg.
John bought a used car for $600 and sold it to Mary for $800. He later bought it back for $1000 and resold it for $1200. How much profit did John make?
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Clue
$400. HE MADE A PROFIT OF $200 EACH TIME HE SOLD THE CAR
IT WOULD TAKE 5 MINUTES. EACH MACHINE TAKES 5 MINUTES TO MAKE ITS WIDGET. THEREFORE, EACH OF THE 100 MACHINES WOULD HAVE FINISHED MAKING ITS WIDGET IN 5 MINUTES
20 TIMES. THEY ARE 9, 19, 29, 39, 49, 59, 69, 79, 89, 99 (2 TIMES) FOLLOWED BY 90, 91, 92, 93, 94, 95, 96, 97, 98
1ST METHOD: 7⁄.7 X 7⁄.7 2ND METHOD: 77⁄.77
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