4. Your landscaping expert has advised you that your lawn sprinkler system should be expanded upgraded in three years--at an expected cost of about $3100. You decide to set up a sinking fund, and the current rate is 4.9% compounded monthly. What will you fixed monthly payment be? 5. What is the annual nominal rate compounded quarterly on your savings account which has an annual percentage yield of 6.2%? 6. How long will it take for money to double if invested at 5.8% compounded monthly? 7. You and yours plan a business venture in 10 years requiring your capital investment at that time of $53,000. How much will you need to deposit now at 6.9% compounded weekly in order to have that amount to invest then