Jenny is shopping for new colored pens. She has only $11.00 to spend and finds that each pen costs $1.25. What is the reasonable domain for the number of pens she can buy?

Jenny buys 8 pens and is left with $1.00.

Step-by-step explanation:

Cost of each pen = $ 1.25

Total amount to spend = $ 11.00

Now, by the multiplication table, we find that

$ (1.25) x 8 = $10.00

and $ (1.25) x 9 = $11.25

As, $11.25 > $11.00, so she can not buy 9 pens.

⇒ she buys 10 pens of $10.00

Hence, Jenny buys 8 pens and is left with $1.00.