Please help me solve for x and find missing side lengths and angle measures,,

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

Icould really use some with this question.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?