The marginal rate of substitution will be 0.66
Marginal rate of substitution (MRS) is the rate at which a consumer can give up some amount of one good in exchange for another good while maintaining the same level of utility. The marginal rate of substitution for goods x for goods y is:
Price of goods (x) divided by the price of goods(y). That is,
MRSxy = (Px / Py)
MRSxy = 20 / 30
MRSxy = 0.66
Therefore the marginal rate of substitution will be 0.66
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