Please help me Cam, Yusef, and Spencer have resolved to drink more water each day. The recommended amount of water per day is 64 ounces.

1. At breakfast, Yusef drinks 16 ounces of water. What percentage of the daily amount of water does Yusef drink at breakfast? Show your work and/or explain your reasoning.

2. Spencer decides to drink more than the recommended amount. By dinner time, he has already drunk 64 ounces of water, which is 80% of his goal for the day. How many total ounces of water does Spencer plan to drink? Show your work and/or explain your reasoning.