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Question

A library charges ₹ 5 for issuing a book for one day and ₹ 1 per day thereafter. If Ritu had taken a book for 5 days, then find the total amount that is needed to be paid.


Correct Answer
A
9
Your Answer
B
2
Your Answer
C
3
Your Answer
D
5

Solution

The correct option is A 9
Let total amount charged be y and number of days be x.

Total amount = (Amount charged for first day) + [(Amount charged for total number of days the book is kept -1) × (Amount charged from second day onwards)]
y=5+(x1)×1
y=5+(x1)
y=4+x
y=4+5
y=9

This can also be interpreted using graph as shown below.
x012y456

From graph of 5 days i.e. for x = 5, y = 9

 For 5 days, Ritu has to pay ₹ 9.

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