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This one is not difficult, but needs to work from the last part of the question. Can draw a big bar and divide according to the question to visualize better.

$1.50 —–> (+2) = $3.50 —-> (x2) = $7.00 —> (+3) = $10 —-> (x2) = $20 —-> (+5) = $25 —-> (x2) = $50.

Ref: http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=1839#p1839

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