From the statement, we have that the number of women who wear only one earring is $0.03 \times 800=24$. There remain $800-24=776$, of which 388 wear two earrings and 388 do not wear earrings. Therefore, the total number of earrings worn by all the women is: $24+388 \times 2=800$.
2 - If each woman with two earrings gives one of hers to one of those who don't have any, all 800 women will end up with a single earring. Therefore, the number of earrings is equal to the number of women, which is 800.