Verified Answer :

The eqaution i use for this is:
\(\frac{is}{of} = \frac{x}{100}\)

\(\frac{25.83}{49.5} = \frac{x}{100}\)      (cross multiply)
(25.83)(100) = (x)(49.5)                                       (multipy)
2583 = 49.5x                                                      (divide by 49.5 on both sides)
52.181818182 = x