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David invested $220 in a savings account that offers a 3% return on the investment. the value of david's investment will be at least $400 after a period of years.
hint: use the formula a = p(1 + r)t, where a is the amount after t years, p is the amount invested, r is the rate of interest, and t is the time period.
use a calculator to compute the answer, and round it off to the nearest year.
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