Question

If it costs Susan $25 to rent a truck for 1 hour and $100 to rent a truck for 4 hours, how much will it cost for her to rent a truck for her entire 8-hour work day? A. $150 B. $200 C. $225 D. $250

Answer 1

Answer:

Option B. $200

Step-by-step explanation:

Let

x ----> the number of hours

y ----> the cost to rent a truck

we know that

For x=1, y=25

For x=4. y=100

In this problem we have a proportional relationship between the variables x and y

so

The linear equation that represent this situation is

$y=kx$

where

k is the constant of proportionality (is the same that the unit rate)

$k=\ 25\ per\ hour$

$y=25x$

For x=8 hours

substitute in the linear equation

$y=25(8)=\ 200$