I will give brainliest for the answer with working out :)

First Selling Price: OP=$200

Second Selling Price: OP=$25

Third Selling Price: OP=$524

Fouth Selling Price: OP=$10

Step-by-step explanation:

First Selling Price:

OP=(224 * 100) / (100+12)

OP=22400/112

OP=$200

Second Selling Price:

OP=(62.50 * 100) / (100+150)

OP=6250/250

OP=$25

Third Selling Price:

OP=(660.24 * 100) / (100+26)

OP=66024/126

OP=$524

Fourth Selling Price:

OP=(38.50 * 100) / (100+285)

OP=3850/385

OP=$10

4

Step-by-step explanation:

Given the equation :

2x²+ (4- k)x - 17 = 0

a = 2, c = - 17 b = (4 - k)

For the equation above to have one root; equal but opposite in sign

Then;

(ax + c) = 0 and b = 0

Since b = 0, the we can solve for k

b = 4 - k

b = 0

4 - k = 0

4 = k