Answer:
A) 225
CPI base year = $200
CPI later year = $450
CPI for the later year = ($450 / $200) x 100 = 225
2016 2017
Item Quantity Price Quantity Price
Books 10 $30 8 $50
Pens 20 $1 15 $2
Nominal GDP 2016 = (10 x $30) + ($20 x $1) = $300 + $20 = $320
Nominal GDP 2017 = (8 x $50) + ($15 x $2) = $400 + $30 = $430
Real GDP 2017 using 2016 as base year = (8 x $30) + ($15 x $1) = $240 + $15 = $255