Final answer:
20% of the original order of roses did not arrive. The florist received 16 dozen out of an expected 20 dozen, so 4 dozen are missing, which is 1/5th or 20% of the original order.
Step-by-step explanation:
The florist received 16 dozen roses out of the original order of 20 dozen, which means there are 20 - 16 = 4 dozen roses missing.
To find the percent of the order that did not arrive, we need to calculate the fraction of the missing roses over the total order and then convert it to a percentage.
First, we find the fraction of the missing order, which is 4 dozen missing divided by 20 dozen total.
The fraction is 4/20, which simplifies to 1/5.
To convert this to a percentage, we multiply by 100, resulting in 20% of the order that did not arrive.
So, 20% of the original rose order did not arrive at the florist's shop.