Each of the three oldest children sleeps in a twin bed. They all need bed sheets. A brand of sheets is on sale for "Buy one get one at 50% off". If each sheet costs $18.00, how much will two sheets cost? How much will six sheets cost?

Another brand of sheets is on sale 30% off with a regular price of $18.00 per sheet. Which is a better deal, the previous example or this one? Explain.

Step-by-step explanation:

Two sheets will cost: $27

The value of the first sheet will be $18, and since the other sheet is half off it will be half of the original value: 18 * 0.5 = 9.

Then you add the values together: 18 + 9 = 27.

Six sheets will cost: $81

For every sheet that is the original value there is a sheet that is half off. So since there are six sheets, 3 of the sheets will be $18 and three of them will be $9. We already know that 18+9=27, so just multiply that value by 3.

27*3 = 81

Better deal: The second example

In the second example sheets are 30% off. 30% of 18 is $6. Subtract that value from 18 and you will get $12. In the second example one sheet is $12.

If we multiply that value by 2, we will get $24.

In the first example, two sheets costs $27, while in the second example two sheets cost $24. Since the cost is less for the second example, the second example is the better deal.