In the forth paragraph the author tells us that the young couple's apartment has "a letter-box into which would go and an electric button from which no mortal finger could coax a ring."
what does the narrator mean?

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.

answer; i believe the answer is 80%, plz check first good luck;

answer; no longer than a reasonable period of time;