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14 cards from this deck
Divide by 100
Convert % to decimal, then multiply by y
1−0.4=0.61 - 0.4 = 0.61−0.4=0.6
1+0.15=1.151 + 0.15 = 1.151+0.15=1.15
Divide x by y, multiply by 100
ChangeOriginal×100\frac{\text{Change}}{\text{Original}} \times 100OriginalChange×100
Always the original value, not final value
Identify %, divide by %, find 1%, multiply by 100
Never 100% - always more or less than 100%
Same amount earned each period, calculated on original only
Calculate interest for 1 period, multiply by number of periods
Must be the same/consistent throughout
Original cost price, not selling price
120%120\%120% of original (100%+20%100\% + 20\%100%+20%)
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