There is no need to mix old and new compost. Old compost ,if ready, should be used on its own. New material will take time to rot down to compost.
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Take the old value and subtract from the new value, then divide by the old value. Multiply by 100. That number representsthe percent change.
100%
percent increase = (new amount - old amount)/ old amount = (8.80 - 2.05)/2.05 = 3.29268 = 329.27 %
percentage decrease = (100 - ((new number / old number) * 100)
Subtract the old (60) from the new (94), then divide by the old value (60). Thus: (94 - 60) / 60 = 0.566666667 Round up to 57 and add the % So the increase is 57%