I have equivalent expertise with that of an adept in both languages. as written in my profile I own my B2 in German and C1 in English. As a settled fact, this is appreciable to remind that a translation needs some extra efforts in his field as compared to ordinary content writing. In order maintain accuracy, a translator goes through a variety of courses and primitives of both language.
I am charging cost relatively lower than other because of my little less experience in the field but soon with progress in portfolio with increased reach, the cost would become ordinary.