Delta%? – compute percent change
Percent applies a percentage to the number you specify. So, if you want to know what is 35% of some number, tap the number, then %, then the = button. Tap 56.95, %, 25, = 14.2375.
Percent change computes the total that results after applying a percentage, plus or minus, to it. For example, that antique Tux penguin in your geek boutique at an 85% markup. Tap 5.50 (your cost), Delta%, 85, and the big = button. The penguin's price tag is $10.18.
The %? button computes "What percentage of this is that?" The first number you enter is the comparator, and second is the comparatee. So, first number 100, second number 50. It's like asking "What percentage of 50 is 100?" Tap 100, %?, 50, and the answer is 200.
Delta%? is similar. It figures out by what percentage you'd have to multiply the second number to get the first. Enter 100, tap Delta%?, tap 85 and =. You'd reap a 17.6470588% markup on an $85 item to charge $100 for it.
Example: That new car you want to buy me has a $50,000 sticker price. You can finance it at Greedmongers Bank and Trust for 5% annual percentage rate on a 24-month term, and the payments will be… you figure it out. And please send over the ignition key soon.
Example: Monthly payment on a $75,000 thirteenth mortgage, 30 years at 5.5% annual percentage rate. Set Begin/End to END.
Set Payments / year to 12
Set PV to 75000
Set FV to 0
Erase any entry in Pmt and leave it blank (not 0, blank!)
Set APR to 5.50
Set N to 360 (=30 years times 12 payments per year)
Tap Solve and the payment amount appears in the Pmt line: 425.84175101025.
Using the Amrt function, you find out that the last payment tidies up $423.90 of principal and $1.94 interest, leaving a balance of zip. The payment has a negative sign because it's cash out. To have the calculator allow for beginning and ending payments, subtract them (add, if it's cash incoming) from the present and future values. So, $75000 minus your $12,500 down payment leaves a mortgage of $62,500.
Another useful example: Money in savings accounts (wise). If you open an account for, say, $5,000, how much will you have after 20 years at 5% interest?
Set Begin/End to END
Enter 12 for payments per year (monthly)
Enter 5000 for PV
Clear the FV line entirely
Enter 0 of Pmt (we don't need that variable)
Enter 0.50 for APR
Enter 240 for N (5 years, in months)
Tap Solve and you get a FV of 5,525.7395015745
Your mileage will vary according to the number of times during a year the interest is compounded. For example, the TI model BA-plus calculator assumed a quarterly compounding and came up with $5,524.48 instead.
Conclusion
The Treo 650 and 700P include powerful math, trigonometry, and financial calculators, and that's just the beginning. Curious that the powerful features aren't documented in Treo manuals, but the information in this and the next part of this continuing saga should get you going.
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Read Merciful by Casey Adolfsson