» Net Present Value (NPV) and Profitability Index (PI) Calculator
\begin{align}
NPV &=-C_{0}+\sum_{i=1}^{t}\frac {C_{i}}{(1+r)^{i}}\\
\\
PI &=\frac{\sum_{i=1}^{t}\frac {C_{i}}{(1+r)^{i}}}{C_{0}}\\
\end{align}
Playful learning for kids. Get the App!
TeddyBase is a playful educational app for iPhone and iPad, developed by calkoo.com team — perfect for kids and families to explore, learn, and imagine together! Learn colours, letters, shapes and more!