When rounding to a specific place, take a look at the digit immediately to the right of the target. If that digit is 4 or less, zero everything to the right of the target out. If that digit is 5 through 9, increase the target by one and zero everything to the right of it out. If the target is a 9, increasing it will turn it to zero and increase the digit to the left of the target by one.
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Round to the nearest decimal
Add your whole numbers
Only if you are rounding up to the nearest dollar. Normal rounding rules would make it 40.
That depends on the rounding rules used.
See related link below for a good explanation