exam Maths Puzzle Numerical Ability

IF a man invests $5,000 some at 4% and some at 6% and his annual return is $800 how much does he invest at each rate?

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Hi can you help me with the following problem?
Write the answer in standard form of scientific notation correctly rounded to 2 figures.
(8.69 x 10^-9) ( 5.20 x 10^6)
_________ The formula to figuring the weight at different heights is w=Cr(neg squared). I know that C=1,570,536,900. If w=100 at sea level (r)=20,924,640 feet, how can w = 100? How do you