Assume the probability density function (pdf) of a zero-coupon bond with a notional value of $10.00 is given by $f(x) = \frac{x}{8} - 0.75$ on the domain [6,10] where x is the price of the bond:

$$f(x) = \frac{x}{8} - 0.75 \quad \text{s.t. } 6 \leq x \leq 10 \text{ where } x = \text{bond price}$$

What is the probability that the price of the bond is between $8.00 and $9.00?