The answer depends on the units used for 565. It should be obvious to anybody that the answers for 565 Euros and 565 Yen will be very different.
It is: 600
560
To the nearest whole dollar, it is $358.
The nearest dollar is $328.00
420.166 to the nearest dollar is 420
It is already to the nearest dollar.
$24.89 to the nearest dollar = $25
The nearest dollar to $1.09 is $1.00
99.54 to the nearest dollar is 100
'6.00' does NOT have any currency symbol . So how can it be rounded to the nearest dollar. If you mean $6.00, then the nearest dollar is $6.
$1002 is $1002 when rounded to the nearest dollar. 1002 cents is $10 if rounded to the nearest dollar.
$65.16 rounded to the nearest dollar = $65 65.16 cents rounded to the nearest dollar = $1