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Find the cost of each item in 10 years, assuming an inflation rate of \( 7 \% \) (compounded continuously). (Round your answers to the nearest cent.) (a) movie admission, \( \$ 8.00 \) \( \$ \) (b) CD, \( \$ 14.95 \) \( \$ \) (c) textbook, \( \$ 110.00 \) \$ (d) electric bill, \( \$ 105 \) \( \$ \) (e) phone bill, \( \$ 35 \) \( \$ \) (f) pair of shoes, \( \$ 75 \) \( \$ \) (g) new suit, \( \$ 590 \) \( \$ \) (h) monthly rent, \( \$ 900 \) \( \$ \)

Ask by Gordon Johnson. in the United States
Feb 26,2025

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In 10 years, the costs will be approximately: (a) \$16.11 (b) \$30.11 (c) \$221.51 (d) \$211.44 (e) \$70.48 (f) \$151.03 (g) \$1187.66 (h) \$1812.38

Solution

We are given a continuous inflation rate of 7% per year. The formula for continuously compounded growth is:   Future Value = Present Value × e^(r×t) where r = 0.07 (7%) and t = 10 years. Step 1. Compute the growth factor:   Growth Factor = e^(0.07×10) = e^(0.7) Using a calculator, e^(0.7) ≈ 2.01375. Step 2. Multiply each present cost by the growth factor: (a) Movie admission, $8.00:   Future cost = 8.00 × 2.01375 ≈ $16.11 (b) CD, $14.95:   Future cost = 14.95 × 2.01375 ≈ $30.11 (c) Textbook, $110.00:   Future cost = 110.00 × 2.01375 ≈ $221.51 (d) Electric bill, $105:   Future cost = 105 × 2.01375 ≈ $211.44 (e) Phone bill, $35:   Future cost = 35 × 2.01375 ≈ $70.48 (f) Pair of shoes, $75:   Future cost = 75 × 2.01375 ≈ $151.03 (g) New suit, $590:   Future cost = 590 × 2.01375 ≈ $1187.66 (h) Monthly rent, $900:   Future cost = 900 × 2.01375 ≈ $1812.38 Thus, rounding to the nearest cent, the costs in 10 years will be approximately: (a) $16.11 (b) $30.11 (c) $221.51 (d) $211.44 (e) $70.48 (f) $151.03 (g) $1187.66 (h) $1812.38

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To calculate the future cost of items considering an inflation rate of \( 7\% \) compounded continuously, you can use the formula: \[ A = Pe^{rt} \] Where: - \( A \) is the amount of money accumulated after n years, including interest. - \( P \) is the principal amount (the initial sum of money). - \( r \) is the annual interest rate (decimal). - \( t \) is the time the money is invested for in years. - \( e \) is the base of the natural logarithm (approximately equal to 2.71828). Now let’s calculate the cost for each item in 10 years: (a) Movie admission (\$8.00): \( A = 8 e^{0.07 \times 10} \) \( A \approx 8 e^{0.7} \approx 8 \times 2.0138 = 16.11 \) Cost: \( \$16.11 \) (b) CD (\$14.95): \( A = 14.95 e^{0.07 \times 10} \) \( A \approx 14.95 e^{0.7} \approx 14.95 \times 2.0138 = 30.12 \) Cost: \( \$30.12 \) (c) Textbook (\$110.00): \( A = 110 e^{0.07 \times 10} \) \( A \approx 110 e^{0.7} \approx 110 \times 2.0138 = 221.52 \) Cost: \( \$221.52 \) (d) Electric bill (\$105): \( A = 105 e^{0.07 \times 10} \) \( A \approx 105 e^{0.7} \approx 105 \times 2.0138 = 211.45 \) Cost: \( \$211.45 \) (e) Phone bill (\$35): \( A = 35 e^{0.07 \times 10} \) \( A \approx 35 e^{0.7} \approx 35 \times 2.0138 = 70.48 \) Cost: \( \$70.48 \) (f) Pair of shoes (\$75): \( A = 75 e^{0.07 \times 10} \) \( A \approx 75 e^{0.7} \approx 75 \times 2.0138 = 150.99 \) Cost: \( \$150.99 \) (g) New suit (\$590): \( A = 590 e^{0.07 \times 10} \) \( A \approx 590 e^{0.7} \approx 590 \times 2.0138 = 1186.13 \) Cost: \( \$1186.13 \) (h) Monthly rent (\$900): \( A = 900 e^{0.07 \times 10} \) \( A \approx 900 e^{0.7} \approx 900 \times 2.0138 = 1812.42 \) Cost: \( \$1812.42 \) Here’s a summary of the costs in 10 years: - (a) Movie admission: \( \$16.11 \) - (b) CD: \( \$30.12 \) - (c) Textbook: \( \$221.52 \) - (d) Electric bill: \( \$211.45 \) - (e) Phone bill: \( \$70.48 \) - (f) Pair of shoes: \( \$150.99 \) - (g) New suit: \( \$1186.13 \) - (h) Monthly rent: \( \$1812.42 \)

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