TiNspire users can easily solve Finance and Business related problems STEP BY STEP using the Finance Made Easy at
https://www.tinspireapps.com/?a=FME .
The extensive Time Value section of the menu shows Simple Interest, Future and Present Value, Compounded Interest, Annuities, NPV , IRR and MIRR (further down)
Lets start off with a basic tax (i.e. VAT) problem where we have to add 30% to $1000 to get $1300 .
Vice versa , we can also subtract interest from a given amount (i.e. pay check) by entering a negative % , see below:
