Answer:
80%
Step-by-step explanation:
First, you can find out what percentage of last year's cream was used this year by dividing last year's amount by the updated amount.
157,782/788910 = 0.2
Then multiply that by 100 to get the percentage.
0.2 x 100 = 20
This means only 20% of the cream was used compared to last year's and therefore there must have been an 80% decrease.