In order to find the cost of one ounce, you need to first find the unit rate. This means divide $2.89 by 4.25, giving you .68 as your final answer. Hope I helped :)
If you divide 8400 by 14000. You will see that $8400 is 60% (.60 in the calculator) you need to subtract that from 100 to find the discount. 100-60= 40
