Table $11\mathrm{.}3\mathrm{.}1$

$\backslash$table$[[\backslash$table$[[$Real GDP$],[($billions of $2012],[$dollars$)]],\backslash$table$[[$Aggregate planned$],[$expenditure$],[($billions of $2012],[$dollars$)]]],[0,100],[200,260],[400,420],[600,580],[800,740]]$

Refer to Table $11\mathrm{.}3\mathrm{.}1,$ which shows aggregate planned expenditure and real GDP in an economy. What is the economy's multiplier?

Select one:

a$.$ It is $2\mathrm{.}5.$

b$.$ It is $1\mathrm{.}8.$

c$.$ It is $4.$

d$.$ It is $5.$

e$.$ It cannot be determined without more information.