The active ingredient in Pepto-Bismol ® (an over-the-counter remedy for an upset stomach) is bismuth subsalicylate, C₇H₅​BiO₄​. Analysis of a 1.7500-g sample of Pepto-Bismol yields 346 mg of bismuth. What percent by mass is bismuth subsalicylate in the sample? (Assume that there are no other bismuth-containing compounds in Pepto-Bismol.)