64/10 = 6.4 x 2 = 12.8
64 - 12.8 = 51.2
The percent in the decrease of 25 to 20 = 20%
Both are correct, depending on the context. If decrease is a noun then decrease of is correct. eg This year we have seen a decrease of 20 percent. If decrease is a verb then decrease by 20 percent is correct. eg This year we can decrease the price by 20 percent.
20% decrease.
20 percent decrease.
This is a decrease of 20%
20% decrease
20% decrease.
20% decrease
20% decrease.
20% decrease.
20% decrease.
68.75% decrease.