Math Problem Statement

Jon is to receive 10 annual payments where the first payment of 10,000 will be paid in one year. Payments in years 2-10 will increase by an annual rate of 5%. The present value of these payments using an annual effective interest rate of 8% is X. Calculate X.

Solution

To calculate the present value XX of the payments Jon will receive, we need to discount each future payment back to the present using the given 8% annual effective interest rate.

Here’s how to approach the problem step by step:

Step 1: Define the payments

Jon will receive 10 payments. The first payment is 10,000, and subsequent payments increase by 5% annually. The payment stream is thus:

  • Year 1: P1=10,000P_1 = 10,000
  • Year 2: P2=10,000×(1.05)P_2 = 10,000 \times (1.05)
  • Year 3: P3=10,000×(1.05)2P_3 = 10,000 \times (1.05)^2
  • And so on, until Year 10: P10=10,000×(1.05)9P_{10} = 10,000 \times (1.05)^9

Step 2: Discount the payments

The present value XX is the sum of the discounted values of each of the 10 payments. The discount factor for each year is based on the annual effective interest rate of 8%. The discount factor for a payment in year nn is 1(1.08)n\frac{1}{(1.08)^n}.

Thus, the present value XX is:

X=10,0001.08+10,000×1.05(1.08)2+10,000×(1.05)2(1.08)3++10,000×(1.05)9(1.08)10X = \frac{10,000}{1.08} + \frac{10,000 \times 1.05}{(1.08)^2} + \frac{10,000 \times (1.05)^2}{(1.08)^3} + \cdots + \frac{10,000 \times (1.05)^9}{(1.08)^{10}}

Step 3: Write it as a summation

The above expression can be simplified into a summation formula:

X=n=11010,000×(1.05)n1(1.08)nX = \sum_{n=1}^{10} \frac{10,000 \times (1.05)^{n-1}}{(1.08)^n}

Now, let's compute this summation to find the present value XX. I will calculate it for you.The present value XX of Jon's 10 annual payments is approximately $81,835.54, given the 8% annual effective interest rate.

Would you like more details or have any questions?

Here are five related questions you might find interesting:

  1. How would the present value change if the interest rate were higher, say 10%?
  2. What if the payment increases by 6% annually instead of 5%?
  3. How would you calculate the future value of these payments after 10 years?
  4. Can you determine how much Jon would receive in total over the 10 years without discounting?
  5. How would the present value be affected if Jon receives payments semi-annually instead of annually?

Tip: When dealing with increasing payments, calculating present value using a summation of discounted cash flows is crucial to account for both growth and time value of money.

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Math Problem Analysis

Mathematical Concepts

Time Value of Money
Discounted Cash Flow
Geometric Series

Formulas

Present Value of Payments: X = ∑ (P_n / (1 + i)^n)
P_n = Initial Payment × (1 + Growth Rate)^(n - 1)
Discount Factor: 1 / (1 + Interest Rate)^n

Theorems

Discounted Cash Flow
Time Value of Money

Suitable Grade Level

Undergraduate Finance or Actuarial Science