Answer:
Step-by-step explanation:
Maybe your questions has some wrong numbers in it? but, going by what's in your questions , just 1 cup of flour :/ seems too easy
420 x .1 = 42
420 + 42 = 462
400 x .2 = 80
400 + 80 = 480
The first one is cheaper
Add the equations.
x-y%2B0.5x%2By=7%2B5
1.5x=12
highlight%28x=8%29
Now use either equation to solve for y.
8-y=7
highlight%28y=1%29
x=8
y=1