$\dfrac{ 0.8 x 0.04 x 1.25 x 2 5 x 0.6524}{10 x 125 x 4x 25x 8 }$
= $\dfrac{ (0.8 x 1.25) x (0.04 x 25) x 0.6524 } {10 x (125 x 8) x (25 x 4) }$
= $\dfrac{ 1 x 1 x 0.6524 }{10 x 1000 x 100}$
= $\dfrac{ 0.6524}{1000000}$
= $\dfrac{6524}{10000000000}$
= $\dfrac{1631}{2500000000}$