The percentage increase of a given quantity from 20 to 40 is 100%.
Original quantity = 20
New quantity = 40
In order to calculate the percentage increase, one had to subtract the original quantity from the new quantity and then divide the value by the original quantity. This will be:
= (New quantity - Original quantity) / Original quantity × 100
= (40 - 20) / 20 × 100
= 20/20 × 100
= 1 × 100
= 100%
Therefore, the percentage increase of the quantity from 20 to 40 is 100%.
