The owner of a bookstore buys used books from customers for $1.50 each. The owner then resells the used books for 400% of the amount he paid for them. What was the price of a used book in this bookstore?

Answer 1

To determine the resale price of a used book in the bookstore, we start with the amount the owner pays for each book, which is $1.50. The owner then resells the book for 400% of that purchase price.

First, we calculate what 400% of $1.50 is:

\[ 400% \text{ of } 1.50 = 4 \times 1.50 \]

Now, we perform the multiplication:

\[ 4 \times 1.50 = 6.00 \]

Thus, the resale price of a used book in the bookstore is:

\[ \boxed{6.00} \]

So, the price of a used book in this bookstore is $6.00.