A notebook costs three times as much as a pen. If a pen costs $1.50, how much will Lyle pay for 4 notebooks?
Use reasoning to answer the following question.
18
A notebook costs $1.

50 x 3 = $4.

50.

So Lyle will pay $4.

50 x 4 = $18 for the 4 notebooks.

.

The answer is 18