Unit Rate and Which is better to buy

Question

12 Blank DVD’s for $17.99

&

80 blank DVD’s for $99.99

What is the unit rate for each and which is better to buy?

Answer 1

$17.99 divided by 12 = 1.49916

$99.99 divied by 80 = 1.249875

Answer 2

To find the unit rate in this situation means to determine how much 1 of each item would cost. I would first start by rounding up my prices. 12 blank DVD's can cost $18 instead of 17.99, and 80 blank DVDs can cost $100 instead of 99.99. Next you can divide. I can divide $18 by the 12 DVDs to determine how much 1 DVD cost. When dividing 18 by 12, I get $1.50. In this situation 1 DVD cost $1.50. I will repeat that same process to the next set of DVDs. 80 DVDs cost about $100. To determine how much 1 of these DVDs cost, I will divide 100 by $80. When I do this, I get $1.25. In this situation 1 DVD cost $1.25, making this scenario the better buy. The second option is the better buy because each unit is less expensive.