100% of the price = $400
x % of the price = $320
we need to find x
using a proportion
100 : 400 = x : 320
100 * 320 = 400 * x
32000 = 400x
x = 32000 / 400
x = 80
That means the new price is 80% of the previous price.
100% - 80% = 20%
and based on this we can make a conclusion that the discount was 20%
I hope it is clear to you, feel free to ask anything about it :)

so, the 2.5oz cake will be "x" calories, pheeew, she'll be taking in 900 - x less calories.
3 to the power of 3 is 9 or 3x3=9
9/3=3
Answer: 439.82
Step-by-step explanation:
C=2πr=2·π·70≈439.82297