Questions: Nelda deposited 500 in a bank that is paying 2% interest daily. Identify the function P that represents the amount of money she will have after t years.
A. P=500 e^0.02 t
B. P=500(1.02)^t
C. P=500 e^1.02 t
D. P=500(1+0.02/12)^12 t
E. P=500(1+0.02/365)^365 t
Transcript text: 23. (L29) Nelda deposited $\$ 500$ in a bank that is paying $2 \%$ interest daily. Identify the function $P$ that represents the amount of money she will thave after $t$ years.
A. $P=500 \mathrm{e}^{0.02 t}$
B. $P=500(1.02)^{t}$
C. $P=500 \mathrm{e}^{1.02 t}$
D. $P=500\left(1+\frac{0.02}{12}\right)^{12 t}$
E. $P=500\left(1+\frac{0.02}{365}\right)^{365 t}$
Solution
Solution Steps
Step 1: Identify the Formula
The formula for compound interest is given by
\[
P = P_0 \left(1 + \frac{r}{n}\right)^{nt}
\]
where:
\( P_0 = 500 \) (initial deposit),
\( r = 0.02 \) (annual interest rate),
\( n = 365 \) (number of compounding periods per year),
\( t \) (time in years).
Step 2: Substitute the Values
Substituting the known values into the formula, we have:
\[
P = 500 \left(1 + \frac{0.02}{365}\right)^{365t}
\]
Step 3: Calculate the Amount After 1 Year
To find the amount after \( t = 1 \) year, we substitute \( t = 1 \) into the equation:
\[
P = 500 \left(1 + \frac{0.02}{365}\right)^{365 \cdot 1}
\]
Calculating this gives:
\[
P \approx 510.1003905164615
\]
Thus, the amount after 1 year is approximately \( 510.10 \).
Final Answer
The correct answer is E. \( P = 500\left(1+\frac{0.02}{365}\right)^{365 t} \)