Texas Instruments TI-82 User Manual - Page 14
Entering a Calculation: Compound Interest - used calculators
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Entering a Calculation: Compound Interest Using trial and error, determine when an amount invested at 6% annual compounded interest will double in value. The TI.82 displays up to 8 lines of 16 characters so you see an expression and its solution at the same time. You also can store values to variables, enter multiple instructions on one line, and recall previous entries. 1. Press .06 ¿ ƒ Z (annual interest rate) to store the interest rate. 2. Press y ã:ä to enter more than one instruction on a line. 3. For the first guess, compute the amount available at the end of 10 years. Enter 10 ¿ ƒ Y (years). 4. Press y ã:ä, then enter the expression to calculate the total amount available after Y years at Z interest just as you would write it. Use 1000 as the amount. Press 1000 ¯ £ 1 Ã ƒ Z ¤ › ƒ Y. The entire problem is shown in the first two lines of the display. 5. Press Í to evaluate the expression. The answer is shown on the right side of the display. The cursor is positioned on the next line, ready for you to enter the next expression. 6. To save keystrokes, you can use Last Entry to recall the last expression entered and then edit it for a new calculation. Press y, followed by ãENTRYä (above Í). The last calculated expression is shown on the next line of the display. 4 Getting Started
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