Last year, frank opened an investment account with $6400 . at the end of the year, the amount in the account had increased by 29.5% . how much is this increase in dollars? how much money was in his account at the end of last year?

This is an example of a geometric equation. We can write this as:

y=6400(1.295)^x           where x is the number of years past.

In this case, x is one, as one entire year passed. 

Do the math, and you get 8288 at the end of the year. 

If you subtract 6400 from 8288, you get 1888. That is the difference. 

The answer would be c