The marine iguanas of the Galapagos Islands are the only sea-going lizards in the world. They live on the land,
but graze on algae they find attached to rocks underwater in the ocean. During an El Nino event, the algae all but
disappears. Many iguanas starve. A certain island of the Galapagos Archipelago had a population of 6,624 marine
iguanas. A recent El Nino event lasted 1 year and reduced the population by 70%. What is the monthly rate of
decrease in the population of marine iguanas during this El Nino event?
1) 5.8%
2) 9.5%
3) 90.5%
4) 94.2%
