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3 years ago

10

Sam opened a money-market account that pays 2% simple interest. He started the account with $7,000 and made no further deposits.

When he closed the account, he had earned $420 in interest. How long did he keep his account open?

1 answer:

I am Lyosha [343]3 years ago

8 0

I = prt
420 = 7000 x .02 x t
420 = 140 x t
420/140 = 140 x t /140
t = 3 years

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