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Getting 1.047.
1
(0.6*10*2.8 + 0.2*8*2.8+0.2*6*2.8)/(0.6*10*2.8 + 0.2*1*2.8+0.2*1*2.8)

1.375??
1
I am also getting 1.375
0
I thought CPI reduced by 1 , misinterpreted the problem.

1 Answer

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Old = (0.6*(10*2.8) + 0.2*(8*2.8)+0.2*(6*2.8)) = 24.64 ns

new = (0.6*(10*2.8) + 0.2*(1*2.8)+0.2*(1*2.8)) = 17.92 ns

speedup = old/new = 24.64/17.92 = 1.375

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