Answer:
The accumulated amount after 4 years is $1280.
Explanation:
Principal = $1000
Time = 4 years
Rate of Interest = 7%
SIMPLE INTEREST =

⇒SI =

or, the amount of simple Interest = $280
Now, Accumulated Amount = Principal Amount + Simple Interest
= $1000 + $280
= $1280
Hence, the accumulated amount after 4 years is $1280.