Use the table below to answer the following questions.

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

The following table shows the relationship between aggregate planned expenditure and real GDP in the hypothetical economy of Econoworld.

$\backslash$table$[[\backslash$table$[[$Real GDP$],[($billions of $2007]],\backslash$table$[[$Aggregate planned$],[$expenditure$],[($billions of $2007$ dollars$)]]],[0,100],[200,260],[400,420],[600,580],[800,740]]$

Refer to Table $11\mathrm{.}3\mathrm{.}1.$ If investment increases by $$25$ billion, the real GDP becomes

a$.$ $$725$ billion.

b$.$ $$675$ billion.

c$.$ $$625$ billion.

d$.$ $$600$ billion.

e$.$ $$525$ billion.