In a Certain Economy, the Components of Planned Spending Are

Multiple Choice

In a certain economy, the components of planned spending are given by:  
C = 500 + 0.8(Y - T ) - 300r
I ᴾ= 200 - 400r
G = 200
NX = 10
T = 150
 
Given the information about the economy above, what would be the impact on autonomous expenditures of a one-percentage-point increase in the real interest rate (r ) ?

A) Autonomous expenditures would increase by 35 units.
B) Autonomous expenditures would decrease by 700 units.
C) Autonomous expenditures would decrease by 35 units.
D) Autonomous expenditures would decrease by 7 units.