Questions: Savings Account: 2,100 is deposited in a savings account that pays 4% annually. How much interest is earned at the end of 30 days?
The account earns after 30 days.
Note: Round to the nearest dollar
Transcript text: Savings Account: $\$ 2,100$ is deposited in a savings account that pays $4 \%$ annually. How much interest is earned at the end of 30 days?
The account earns \$ $\square$ after 30 days.
Note: Round to the nearest dollar
Solution
Solution Steps
To calculate the interest earned in 30 days, we need to determine the daily interest rate from the annual rate and then apply it to the principal amount for 30 days. The annual interest rate is 4%, so the daily interest rate is the annual rate divided by 365. Multiply this daily rate by the principal amount and the number of days (30) to find the interest earned.
Step 1: Calculate the Daily Interest Rate
The annual interest rate is given as \( 4\% \), which can be expressed as a decimal:
\[
\text{annual rate} = 0.04
\]
To find the daily interest rate, we divide the annual rate by the number of days in a year (365):
\[
\text{daily rate} = \frac{0.04}{365} \approx 0.0001096
\]
Step 2: Calculate the Interest Earned in 30 Days
The principal amount deposited in the savings account is \( \$2100 \). The interest earned over 30 days can be calculated using the formula:
\[
\text{interest earned} = \text{principal} \times \text{daily rate} \times \text{days}
\]
Substituting the known values:
\[
\text{interest earned} = 2100 \times 0.0001096 \times 30 \approx 6.9041
\]
Step 3: Round the Interest Earned
Rounding the interest earned to the nearest dollar gives:
\[
\text{interest earned rounded} = 7
\]