Using the pseudocode below,

$//$ Start

$//$ Declarations

$//$ num amount

$//$ num newAmount

$//$ num interestRate

$//$ output "Please enter the dollar amount.$"$

$//$ input amount

$//$ output "Please enter the interest rate$($e$.$g$.,$ nine percet should be entered as $9\mathrm{.}0)."$

$//$ input interestRate

$//$ newAmount $=$ FutureValue$($amount$,$interestRate$)$

$//$ output "The new dollar amount is $",$ newAmount

$//$ Stop

$//$

$//$

$//$

$//$ num FutureValue$($num initialAmount, num interestRate$)$

$//$ Declarations

$//$ num finalAmount

$//$ finalAmount $=(1+$ interestRate$/100)*$ initialAmount

$//$ return finalAmount

What C$++$ data type should be returned from the function$/$method$?$