Answer
d. the price level is 2, and velocity is 4
Work Step by Step
Price Level = Nominal GDP/Real GDP = \$400/\$200 = 2
Money Supply, M = \$100
Nominal GDP, P x Y = 2 x \$200 = \$400
Using the Quantity Equation, M x V = P x Y
Velocity, V = (P x Y) / M = \$400/ \$100 = 4