The average person in the United States throws away 450 grams of trash per day. There are about 3,200,000 people in the US (in 2013).
3,200,000*450 = 1,440,000,000 grams of trash PER DAY
It wants to know how many grams of trash in ONE YEAR. So,
1,440,000,000*365 = 525,600,000,000
Rounded, that is 530,000,000,000
That is equal to 5.3x10^11
Let me know if you have any more questions about this!
