Answer:
a) 8%
b) 5%
c) 4%
Step-by-step explanation:
Given:
Growth in real GDP = 3%
Growth of money stock = 8%
Nominal interest rate = 9%
Now,
(a) As per Classical Quantity Theory of Money
Money Supply (M) × Velocity (V) = Price level (P) × Real GDP (Y) 
also,
Nominal GDP = P × Y
Change in M + Change in V = Change in P + Change in Y 
Since,
 V = Constant 
thus, Change in V = 0
Change in M = Change in P + Change in Y
Change in P + Change in Y = Change in Nominal GDP = Change in M
thus,
Change in Nominal GDP = 8% 
(b)
8% = Change in P + Change in Y 
8% = Change in P + 3% 
Change in P = Inflation Rate = (8 - 3)% = 5% 
(c) Real interest rate = Nominal interest rate - Inflation rate 
= (9 - 5)% 
= 4%