MzThixkumz
18.08.2019 •
Mathematics
Chelsea deposits $600 into a bank account and is earning simple interest.after 4 years her account has a balance of $621.60.if chelsea decides to put $1100 into the bank account instead of $600 how much would she have in her account after 7 years?
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Ответ:
$5.40 = x% from $600
5.4 = x/100 * 600
5.4 = 600x/100 / * 100 (both sides)
540 = 600x / ÷ 600 (both sides)
x = 0.9
So the interest rate was 0.9% annually.
Now we have to find out how much is 0.9% from $1100:
$1100 * 0.9% =
= 1100 * 9/1009 =
= 9900/1000 =
= 9.9
It means in one year she would earn $9.90. After 7 years she would earn $9.90 * 7 = $69.30, so she would have in her account:
$1100 + $69.30 = $1169.30
Ответ: