
To find: Cost to rent the gear for 30 minutes and check whether is it more for 40 minutes.

Answer to Problem 66SGR
Cost of rent of gear for 30 minutes is $33.
And also cost of rent of gear for 30 minutes is $33.
Explanation of Solution
Given information:
Cost to rent the gear for 20 minutes intervals = $4
Insurance fee = $25
From given information,
For each 20 minutes interval rent is $4
Therefore,
The shopkeeper rents only for 20minutes intervals.
So, the cost of rent of gear for 40 minutes includes the cost of rent of gear for the time of
20 minutes to 40 minutes.
On cross-multiplication,
We get
The cost of rent for gear for 40 minutes is $8.
Since, the cost of rent of gear for 0 to 20 minutes is $4 and for 20 to 40 minutes is $8.
This pattern shows that, the cost of rent of gear is step function of time with intervals of 20 minutes and along with Insurance fee of $25.
The cost of rent of gear for 30 minutes is $8 and in addition with Insurance fee of $25.
Therefore, the cost of rent of gear for 30 minutes is $33.
As the cost is same for the time interval between 20 minutes and 40 minutes,
Therefore, the cost of rent of gear for 40 minutes is also $33.
Chapter 3 Solutions
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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