Spelling Mistakes in a Text Are Either "Nonword Errors" or "Word

Multiple Choice

Spelling mistakes in a text are either "nonword errors" or "word errors." A nonword error produces a string of letters that is not a word, such as "the" typed as "teh." Word errors produce the wrong word, such as "loose" typed as "lose." Nonword errors make up 25% of all errors. A human proofreader will catch 80% of nonword errors and 50% of word errors. What percent of errors will the proofreader catch?

A) 20%
B) 37.5%
C) 57.5%
D) 80%