Answer :
178/25= 7.12 so she got the bonus of 26 every 7 times so 26x7=142 of the bonus
Now we multiply 8.20 by the 178 books sold =1,459.60 plus the bonus =$1,601.60 money earned
Now we multiply 8.20 by the 178 books sold =1,459.60 plus the bonus =$1,601.60 money earned