Joseph borrowed a book from a library. the library charged a fixed rental for the book and a late fee for everyday the book was overdue. the expression below shows charges Joseph paid for the book when he returned it x days after the due date

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!