[tex] \frac{171f {}^{13} }{o {}^{10} } \times \frac{ {o}^{12} }{11.4 {f}^{10} } = \frac{171f {}^{13} \times {o}^{12} \times 10 }{o {}^{10} \times 114f {}^{10} } = 15o {}^{2} { {f}^{3} } = 15 \times 4 {}^{2} \times 2 {}^{3} = 15 \times 16 \times 8 = 1920[/tex]