1.  Let's say you have a molecule that is made entirely out of four different kinds of subunits called As, Ts, Cs, and Gs. In this molecule, the number of Cs equals the number of Gs and the number of Ts equals the number of As. If one of these molecules is analyzed and found to consist of34% As, then what percent of the molecule is made up of Gs?

 2.  Rachel made a birdhouse tower in her back yard (some birds like to be pretty far off the ground before they will feel comfortable in a bird house close to a human house). She showed it to her teacher who was very impressed. However, he recommended she increase the height by15%, just to be sure the birds would like it. If it was 6 feet 3 inches tall now, how tall should it be if she decides to follow her teacher's advice?


3.  Ifnineteen and four tenthspercent of the volume of gas in a storage tank is oxygen, then all the other gases in the tank make up what percent of the volume of the gases in the tank?

 4.  The voice on the phone was yet another creditor. His coarse voice and rudeness began to infuriate me. "Just how much do I owe?" I demanded. He replied, "You owe$709.79on your credit card. We will have to add a past due charge of$20, an over limit fee of$31, and a service charge of7% of the amount owed on the credit card." I told him I would send a check for the full amount immediately. For how much should the check be written?


5.  The local store is having a sale. All floopers are50% off. If a flooper normally costs$13.48más7% sales tax, how much will it cost to buy a glooper during the sale?

 6.  Brian collects aluminum cans and takes them to the recycling center every week. He put recycling boxes in all the classrooms, the cafeteria, and the teachers' lounge. He put a sign on each box asking people not to put anything but aluminum cans in them. Every week, though, Brian finds objects other than aluminum cans in the recycling boxes. He estimates that fifteen percent of the weight of the material in the boxes is nonrecyclable junk. The total weight of all the items collected in the recycling boxes this week was one hundred sixtynine pounds. What was the weight of the aluminum cans, rounded to the nearest tenth pound?

