Answer: 0.75
Explanation:
Marginal prospensity to consume refers to the proportion of an increase in income that the consumer will spend on the consumption rather than save.
Marginal propensity to consumer will be:
= Change in consumption / Change in Disposable income
= (42000 - 36000)/(50000 - 42000)
= 0.75
Therefore, the correct option is B.