How much money will $9800 be worth in two years if the money is deposited at 5 percent interest compounded annually

$9800+5%($9800)+5%($9800)
$9800+10%($9800)
$9800+$980
$10,780

Original amount = 9800
after one year = 9800(1.05) = 10290
after 2nd year = 10290(1.05) = 10804.5

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.