13. $15,000 is invested in an account that yeilds 5% interest per year. After how many years will the account be worth $91,221.04 if the interest is compounded yearly?

The correct answer is 37 years.

Step-by-step explanation:

Principal (P) invested is $15000

Rate of interest (r) per year is 5% compounded yearly.

Amount (A) of the principal is $91221.04.

Let the principal is invested for x years (t).

According to the problem,

A = P +

⇒ 91221.04 = 15000 ×

⇒ 6.08140267 =

⇒ x = 37

Thus the principal is supposed to be invested for 37 years for it to yield that amount.

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