val 6. Medhi invested $10 000 in treasury bills for 90 days. $139.32 in interest. What rate of interest did the bills earn? 7. Sam invested $800 at 6.5% per year and received $25.64 interest on maturity. How many days, did Sam hold his investment? 8. Suppose you are working with simple interest. If you double the length of time of an investment, do you double the interest earned? Justify your answer with a full explanation. == (1 b c shop cet Apppmaddy-L Apaddy-9 0055"S 1095>>