Answer:
3/4
Step-by-step explanation:
The marginal propensity to consume mpc, is the slope of the consumption function and it is what this question requires us to find
We have income increase to be = 100 dollars
Then consumption increase = 75 dollars
MPC = increase in consumption ,75/increase in income 100
= 75/100
= 3/4
Therefore the marginal propensity to consume also called the slope is 3/4