The "+ Pct" is used for percentage calculations for a fixed, often used percentage. Calculating sales tax is a good application for the "+ Pct" key.
You store the sales tax rate once, then you can calculate the tax and total with tax with one key stroke.
These examples use the Math: General Calculator
|To||Press (CHN, ALG or RPN)||Display x||Display y|
|Store a percentage of 6.75%||6.75 STO Pct||6.75|
|Calculate "tax and total" on 100||100 +Pct||106.75||6.75|
|Calculate "tax and total" on 95.26||95.26 +Pct||101.69||6.43|
In CHN or RPN mode, the y value is displayed if you have more than 1 row of the stack displayed.
In ALG mode, tap SWAP to see the y value. Pressing SWAP swaps the x and y registers.
The "+ x%" Key is similar to the "+ Pct key except that you enter the rate to be used in the x register to calculate % plus total.
|To||Press (CHN, ALG)||Press (RPN)||Display x||Display y|
|Calculate "tax and total" on 100 with 6.75% tax rate||100 = 6.75 [+x%]||100 ENTER 6.75 [+x%]||106.75||6.75|
|Calculate "tax and total" on 95.26 with 6.5% tax rate||95.26 = 6.5 [+x%]||95.26 ENTER 6.5 [+x%]||101.45||6.19|