The chart shows several possible presents. There is no sales tax in the state where they live.

Question

Present Cost ($) Discount (%) Total Paid

Power tools d 15% (+2)

Water skis d + 15 25% (+2)

Jewelry d – 5 10% (+2)

b. What PRESENT or item does the expression 0.90(d – 5) refer to?

Answer 1

The expression \(0.90(d - 5)\) refers to the total cost of the jewelry present after applying a discount.

Here's how to break it down:

• \(d\) represents the original cost of the jewelry.
• The expression \(d - 5\) indicates that there is a discount of $5 on the original cost of the jewelry.
• The term \(0.90(d - 5)\) means that after applying the $5 discount, the remaining amount is then subject to a 10% discount (hence the multiplication by 0.90).

So, the expression \(0.90(d - 5)\) ultimately calculates the total paid for the jewelry after applying both the $5 discount and the 10% discount on the remaining amount.