Alrighty.
First we need to make them all simplified.
So simplified would be [tex] \frac{9}{10} [/tex] times [tex] \frac{5}{4} [/tex] times [tex] \frac{5}{2} [/tex].
Then we multiply the numerator and the denominator. The final answer is [tex] \frac{225}{800} [/tex]
Simplified is [tex] \frac{51}{160} [/tex]