09: The force of interest for 0 st 1 has the expression: b 8 = 1 + bt' for a positive constant b. For an investment fund, you are given: The fund has $5 at t = 0. A deposit of $2 was made at t = 0.50. The value of the fund at t = 1 is $8. Calculate b. A) 0.11 B) 0.15 C) 0.17 0.19 E) 0.23