Sharp EL9900C EL-9900C - Page 94
Advanced Graphing Features, Advanced Keyboard
UPC - 074000016873
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Chapter 6 Advanced Graphing Features - Advanced Keyboard In this chapter, some real-life situations are featured. You are encouraged to modify the examples to make your own graph schemes. Note: To try the examples in this chapter, it is required that the Advanced Keyboard is already set up by the user. To learn how to set up the Advanced Keyboard, read "Changing the Keyboard" in Chapter 1. It should be noted that the following examples assume that the angle mode is set to Rad (radian), the default angle unit for the Advanced Keyboard. If set to degree or gradient, some unexpected results will be obtained. 1. Try it! You have just opened your own bank account, with an initial deposit amount of $2,000. Suppose your monthly income is $3,000, and you will spend 60 percent of what you have in the account every month, how much will your balance be after one year? How much will you have in the account, 6 months from now? The example can be expressed as a sequential equation, as follows: un = un-1 × (1 - 0.6) + 3000 where un is the balance of the current month and un-1 is the balance of the previous month, and n is the month. 84