Consumption Function Suppose that a country’s consumption function is given by where C and I are expressed in billions of dollars. (a) Find the marginal propensity to save when income is $25...

Consumption Function Suppose that a country’s consumption function is given by

where C and I are expressed in billions of dollars.

(a) Find the marginal propensity to save when income is $25 billion.

(b) Determine the relative rate of change of C with respect to I when income is $25 billion.