Thanks Amoonstar, 

You could just do it as 24/100 * 215    

The calculator is on the home page.  

First of all we must find %1

For This

İf %24 of 215, %1=?

$${\frac{{\mathtt{215}}}{{\mathtt{24}}}} = {\mathtt{8.958\: \!333\: \!333\: \!333\: \!333\: \!3}}$$

İf %1=8.958333, What is the %100

Question of us wants it, What is the %100

İf 1 piece is 8.958333, What is the 100 piece

For This

$${\mathtt{8.958\: \!333}}{\mathtt{\,\times\,}}{\mathtt{100}} = {\mathtt{895.833\: \!3}}$$

The Result is 895.83¯

Not Problem Melody

I just tell of Answer

:)