This is app for engineers because it can do complex calculation in microseconds. General people can also use this app for basic calculation and business purpose.
![Ratio App on Casio fx-991EX Classwiz App #12 [SAT, A-Level, IB, AP, Engineering, B. Sc. 2020] screenshot 1](https://i.ytimg.com/vi/1QOU5lv0dmI/mqdefault.jpg)
9Apps 4.9
