You work for a dress makers and your boss sends you to the fabric store to buy yellow fabric. she tells you to buy the best deal. what is the best deal on fabric? a) 5 yards for $20.00 b) 10 yards for $30.00 c) 20 yards for $55.00 d) 35 yards for $90.00

You can divide each amount to see how much one yard is and then go on from there. For the first one do 20 (the cost) divided by 5 (how many yards you get and you get 4. That means it is $4 per yard and then does the rest the same way. 

30/10 = $3 per yard
55/20 = 2.75 per yard
90/35 = 2.67 (rounded) per yard. 

So the best deal would be D. because it costs less per yard. I hope this helps!