Why was investment wealth centered in the northeast?

southerners were investing in their own industries
large sums of money had been made in foreign investments
banking centers had been established by the government
profits from the sea had created a center of finance

The answer to your question would actually be

D. Profits from the sea had created a center of finance.

I also had this question and D was the correct answer.

part a. there were 250 teenagers surveyed (100% of tenagers = 250)therefore 1 % = 250/100 = 2.5 76% = 1% x 76 = 2.5 x 76 = 190 teenagers of the 250 surveyed liked burgerspart b: jane surveyed 25% (which is equal to 50 teenagers, i.e. a quarter of the teenagers surveyed is 50) to get 100% we simply get 4 quarters, i.e. multiply 50 by 4 = 200 teenagers were surveyed by jane. part c: it is impossible to give an example where a percentage is greater than 100%, since, by definition , percentage means "per 100".