Betta Buttons sells sewing notions. In the same market, Nella's Notions holds a 10% share, ZuperZippers holds 28%, Peru Direct holds 14%, and all other firms together hold 21%. Calculate Betta Buttons' market share. Report your answer as a percent. Report 25%, for example, as "25". Round to the nearest percent.
MARKETING METRICS IS THE SUBJECT OF THE QUESTION.