An online bookstore sells a certain book for $21 and charges $10 for the delivery of any number of books.
a. Derive the rule connecting the cost (SC) with the number of books delivered (n).
b. Use the rule to calculate the cost of delivering 35 books.
C. Calculate how many books can be delivered for $1000.
Answers
Given : An online bookstore sells a certain book for $21 and charges $10 for the delivery of any number of books.
To Find :
a. Derive the rule connecting the cost (SC) with the number of books delivered (n).
b. Use the rule to calculate the cost of delivering 35 books.
C. Calculate how many books can be delivered for $1000.
Solution:
1 Book Price = $21
n Books price = 21n $
Delivery charges = 10 $
SC = 21n + 10
cost of delivering 35 books.
n = 35
=> SC = 21(35) + 10
=> SC = 735 + 10
=> SC = 745 $
books can be delivered for $1000.
=> 1000 = 21n + 10
=> 990 = 21n
=> n = 47.14
Hence 47 books can be bought
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