8. Emily has $113.94 in her checking account. During the week, she goes to an ATM and withdraws $40. She is charged a usage fee of $2.50. The following week she deposits her paycheck of $189.73. She writes two checks, one for $22.50 and the other for $70.18. What is the current balance in her checking account?
a. $170.99
b. $168.49
c. $145.99
d. -$21.24
9. Tammy sold a diamond ring for $10,000. She placed half of the money into a CD with a 3.9% interest rate compounded daily. She placed the other half into a CD with the same interest rate but compounded monthly.
What is the difference in the interest earned on each amount after 4 years ?