here something to think about for 2:
getting one dollar in year 1 is equal to getting 1.12^99 or 74,573.45 dollars in year 100 because with interest the 1 dollar will become 74,573.45 in 99 years.
after an infinite number of years, they are all infinite, but one grew faster than the rest and that one is the answer. for example, which is more valuable: getting paid $1/year forever or getting paid $2/year forever?
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