Answer: 0.75,
The constant of proportionality is the ratio between two directly proportional quantities.
The cost of book changes but the lost book fee charge remains constantper book i.e.0.75
Step-by-step explanation:
Given: Let x be the cost of her book (in dollars).
Since, her school charges a lost book fee equal to 75% of the cost of the book.
Then, the the lost book fee=75% of x
Since 75% =0.75
Thus, the the lost book fee=$0.75x
The cost of book changes but the lost book fee charge remains constant per book i.e.0.75
Sarah received a notice stating that she owed the school $60 for he lost book.
The the lost book fee=