EXAMPLE 5 Model continuously compounded interest A = Pe rt SOLUTION Finance You deposit $4000 in an account that pays 6% annual interest compounded continuously.

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EXAMPLE 5 Model continuously compounded interest A = Pe rt SOLUTION Finance You deposit $4000 in an account that pays 6% annual interest compounded continuously. What is the balance after 1 year? Use the formula for continuously compounded interest. Write formula. Substitute 4000 for P, 0.06 for r, and 1 for t. =4000e 0.06(1) Use a calculator. The balance at the end of 1 year is $ ANSWER

GUIDED PRACTICE for Example 5 A = Pe rt SOLUTION FINANCE: You deposit $2500 in an account that pays 5% annual interest compounded continuously. Find the balance after each amount of time? Use the formula for continuously compounded interest. Write formula. Substitute 2500 for P, 0.05 for r, and 2 for t The balance at the end of 2 years is $ ANSWER a. 2 years =2500e 0.10 =2500e =

GUIDED PRACTICE for Example 5 A = Pe rt SOLUTION FINANCE: You deposit $2500 in an account that pays 5% annual interest compounded continuously. Find the balance after each amount of time? Use the formula for continuously compounded interest. Write formula. Substitute 2500 for P, 0.05 for r and 5 for t The balance at the end of 5 years is $ ANSWER b. 5 years =2500e 0.25 =2500 e =

GUIDED PRACTICE for Example 5 A = Pe rt SOLUTION FINANCE: You deposit $2500 in an account that pays 5% annual interest compounded continuously. Find the balance after each amount of time? Use the formula for continuously compounded interest. Write formula. Substitute 2500 for P, 0.05 for r and 7.5 for t The balance at the end of 7.5 year is $ ANSWER c. 7.5 years =2500e =2500 e =

GUIDED PRACTICE for Example 5 SOLUTION 11. FINANCE: Find the amount of interest earned in parts (a) – (c) of Exercise 10. The balance at the end of 2 years is $ A = a.2500 = The amount of interest balancedeposit – = $ $2500 – = $262.93

GUIDED PRACTICE for Example 5 SOLUTION 11. FINANCE: Find the amount of interest earned in parts (a) – (c) of Exercise 10. The balance at the end of 5 years is $ A = b.2500 = The amount of interest balancedeposit – = $ $2500 – = $710.06

GUIDED PRACTICE for Example 5 SOLUTION 11. FINANCE: Find the amount of interest earned in parts (a) – (c) of Exercise 10. The balance at the end of 7.5 years is $ A = c.2500 = The amount of interest balancedeposit – = $ $2500 – = $