In parts (a) through (c), determine which is the greater amount and by how much. a) $300 increased by 65% or $600 decreased by 65%. b) $300 increased by 80% or $600 decreased by 80%. c) $300 increased by 40% or $600 decreased by 40%. a) ▼ $ 300 increased by 65 % $ 600 decreased by 65 % is greater by $ nothing.