How many years to get $1000 interest?

Mathematics
Tutor: None Selected Time limit: 1 Day

Ingrid needs $5,000 to purchase camera equipment. She invests $4,000 of her own cash into an account paying 5% interest compounded annually. How many years will be required to earn the $1,000 in interest that she needs?

May 22nd, 2015

4.5 years.......................................................

May 22nd, 2015

I would like to know how you got your answer so I am able to learn from this question.  Can you please sow your work?

May 22nd, 2015

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May 22nd, 2015
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May 22nd, 2015
Feb 21st, 2017
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