Ivan has $50,000 in a savings account that earns 4% interest per year. The interest is not compounded. To the nearest dollar, how much interest will he earn in 5 years?

Here are the coordinates for eight points on the coordinate plane (q > p > 0): a (0, 0), b (p, 0), c (q, 0), d (p + q, 0), e (0, q), f (p, q), g (q, q), and h (p + q, q). which four points, if any, are on the vertices of a square?