Graph the simple interest earned on $950 at an annual rate of 4.2%.

In this exercise, use the add-on method of calculating interest to find the total interest and the monthly payment.

You are investing P dollars at an annual interest rate of r, compounded continuously, for t years. Which of the following would result in the highest value of the investment? Explain your reasoning. Double your interest rate.

Which of the following one-year $\$ 1000$ bank loans offers the lowest effective annual rate?

a. A loan with an APR of $5.9 \%$, compounded monthly

b. A loan with an APR of $5.9 \%$, compounded annually, that also has a compensating balance requirement of $9.7 \%$ (on which no interest is paid)

c. A loan with an APR of $5.9 \%$, compounded annually, that has a $1.2 \%$ loan origination fee

In this exercise, use the add-on method of calculating interest to find the total interest and the monthly payment.

Find the time required for a $1000 investment to (a) double at interest rate r, compounded continuously, and (b) triple at interest rate r, compounded continuously. Round your results to two decimal places.$r = 7 %$

Find the time required for a $1000 investment to (a) double at interest rate r, compounded continuously, and (b) triple at interest rate r, compounded continuously. Round your results to two decimal places.$r = 2.5%$

Investigate the difference between compounding annually and simple interest. Round to the nearest cent. Find the interest for a 6-year CD for $5,000 at an interest rate of 2%, compounded annually.

On January 1, 2020. Langley Co. issued 9% bonds with a face value of $700,000 for$656,992 to yield 10%. The bonds are dated January 1, 2020, and pay interest annually. What amount is reported for interest expense in 2020 related to these bonds, assuming that Langley used the effective-interest method for amortizing bond premium and discount?

An investor earned $\$ 208.76$ in interest in one year on an account that paid $4.25 \%$ simple interest.

How much more interest would the account have earned at a rate of $5.33 \%$ ?

The formula

$$I_t=\frac{I_f}{1-T}$$

gives the taxable interest rate $I_t$ equivalent to the tax-free interest rate $I_f$ for a person in the $(100 \cdot T) \%$ tax bracket. Solve for $T$.

Solve for the unknown interest rate in each of the following:

Find the time required for a $1000 investment to (a) double at interest rate r, compounded continuously, and (b) triple at interest rate r, compounded continuously. Round your results to two decimal places.$r = 3.75%$

Suppose you deposit 100 dollars in Account A with a simple interest rate of 3.4 percent, and 300 dollars in Account B with a simple interest rate of 1.8 percent. One year later, you get a bank statement that shows the interest for Account A is 3.40 dollars, and the interest for Account B is 540.00 dollars. What may have been the bank's error?