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Interest:
a. can work both for you (retirement account) and against you (car payments)
b. can only be positive (retirement accounts, bond yields, savings accounts, etc.)
c. will always work against you (mortgage payments, car payments, etc.)
d. is only beneficial to an investor if it outpaces inflation rates by a rate of two-to-one.
What is A. can work both for you (retirement account) and against you (car payments)