10Calc Business Calculator
10Calc is a full-featured business calculator with all the capabilities of high-end desktop adding machines. It's even better, because you can edit, load or save your tapes (try that on a desktop machine!).
Available exclusively as a Universal App for Windows 10 family devices (PCs, tablets and phones), 10Calc sports a new look, including side and top menus for fast access and improved usability. Most important, 10Calc works great in a resizable window alongside other apps!
10Calc includes all the functions of the earlier Windows 8 version (TenCalc Business Calculator - also available in the Windows Store).
Available for purchase from the Microsoft Store:
https://www.microsoft.com/en-us/p/10calc-business-calculator/9nblggh67q2l