You work delivering food for a local farmer. You sell onions from the farm at these prices: 2 for $1.04, 4 for $2.52, 8 for $4.32, and 16 for $9.12. What is the approximate percentage difference of the two best onion deals according to their unit costs?

A.
2%
B.
4%
C.
7%
D.
9%

D.  9%

Step-by-step explanation:

1.04 / 2 = 0.52

2.52 / 4 = 0.63    best 1

4.32 / 8 = 0.54

9.12 / 16 = 0.57    best 2

if base on the best deal 1 - 0.63

(0.63 - 0.57) / 0.63 = 0.0952  (≈ 0.09 i.e 9%)

the answer will be

-8/2y-8=5/y+4-7y+8/y^2-16

we move all terms to the left:

-8/2y-8-(5/y+4-7y+8/y^2-16)=0

we can not solve this equation