Johns MRS (Marginal Rate of Substitution) is given as: | MRS[tex]_{xy}[/tex] | = dy/dx = MUy/MUx'.
The marginal rate of substitution (MRS) is an economic indices that evaluates the units of good X that John is willing to give up for another unit of good Y. The assumption here, is that both goods provide John with the same amount of utility.
The expression of John's MRS is given below:
Johns MRS Expression is given as:
| MRS[tex]_{xy}[/tex] | = dy/dx = MUy/MUx'
Where X and Y refers to the two goods that John consumes
d'y/d'x = derivates of y as regards x
MU = Marginal utility of two goods, that is goods Y and goods X.
MRS = Px/Py
Y/X = 9/12
= 0.75
It is therefore recommended that John consume 0.75 Ys in relation to X.
Learn more about Marginal Rate of Substitution at;
https://brainly.com/question/13401044
#SPJ1