Answer:
the correct answer is B 1/5
Explanation:
[tex] | \frac{y2 - y1}{x2 - x1} | = a[/tex]
we setup a matrix for two values of x and y:
y2 4 (60/15) all income in product Y
y1 0
x2 0
x1 20 60/3 all income in product X
now we calculate
[tex] | \frac{4 - 0}{0 - 20} | \\ | \frac{4}{ - 20} | = \frac{1}{5} [/tex]