 Скачать презентацию Thurs 4 15 10 SWBAT apply exponents Agenda 1 Workshops Compound

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• Количество слайдов: 8 Thurs, 4/15/10 SWBAT…apply exponents Agenda 1. Workshops: Compound interest & Depreciation HW: Work on projects Compound Interest n Compound interest is interest earned or paid on both the initial investment and previously earned interest. A = the current amount P = the principal or the initial amount r = the annual interest rate expressed as a decimal n = the number of times the interest is compounded each year t = time in years Compounding Periods n n Interest compounded annually occurs once per year Semi-annually occurs 2 times a year Quarterly occurs 4 times a year Monthly occurs 12 times a year INVESTMENTS Laura invested \$6, 600 at an interest rate of 4. 5% compounded monthly. Determine the value of her investment in 4 years? Answer: About \$7, 898. 97 SALARY Ms. Keros received a job as a teacher with a starting salary of \$47, 000. According to her contract, she will receive a 4. 5% interest rate every year. How much will Ms. Keros earn in 5 years? Answer: About \$58, 570. 55 Depreciation/ Exponential Decay n In exponential decay, the original amount decreases by the same percent over a period of time. y = the final amount a = the initial amount r = interest rate per year t = time, in years CARS Leonardo purchases a car for \$18, 995. The car depreciates at a rate of 18% annually. After 6 years, Manuel offers to buy the car for \$4, 500. Should Leonardo sell the car? Explain? Answer: No, the car is worth about \$5, 774. 61 INVESTMENTS Jim’s investment of \$4, 500 has been losing its value at a rate of \$2. 5% each year. What will his investment be worth in 5 years? Answer: About \$3, 964. 93 