Answer: The size of the sugar order decreased by 40%.
Explanation:
1,090 is 100%
654 is 60% of 1,090 (1,090 ÷ 0.6 = 654)
1,090 - 654 = 436, and 436 is 40% (0.4) of 1,090
1,090 (100%) - 436 (40%) = 654 (60%)
The percent of the decrease in the size of the sugar order is 40%.