Step-by-step explanation:
Let the original cost of tailored suit be $ x.
[tex](A) \\ \therefore \: x + 19 \% \: of \: x = 357 \\ \\ \therefore \: x + \frac{19}{100} \: x = 357\\ \\ \therefore \: x + 0.19\: x = 357 \\ \\ \huge\red{ \boxed{\therefore \: 1.19\: x = 357}} \\ which \: is \: the \: required \: equation. \\ \\ (B) \\ \because \: 1.19\: x = 357 \\ \therefore \: x = \frac{357}{1.19} \\\huge\purple{ \boxed{ \therefore \: x = \$ 300}} \\ [/tex]
Thus, original cost of tailored suit is $ 300.
