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Brody deposited $500 into an account that

earns 4.2% interest compounded annually. He
makes no additional deposits and no withdrawals.
Approximately how much interest will the account
have earned after 7 years?
A 167
B 420
C 542
D 665
The answer is A but I need help with the actual equation. like I need the equation to this.

2 answers

500(1.042^7 - 1)
value = 500 (1 + .042)^7

interest = value - 500
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