B increased by 250% compared to 2b decreased by 50%

$a decreased by 25% and $1.2a decreased by 40%

$a decreased by 25% = 0.75a

1.2a decreased by 40% = 0.6*1.2a = 0.72a

2) $b increased by 250% and $2b increased by 50%

$b increased by 250% = 2.5b

$2b increased by 50% = 1.5*2b = 3b

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