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= (1 - 300 / 400) x 100 %
= 100/400 x 100 %
= 100/4 %
= 25 %
b) W = Q (1 - T2/T1)
= 3 x 10^5 ( 1 - 300/400)
= 3 x 10^5 (100/400)
= 0,75 x 10^5
= 7,5 x 10^4 Joul
c) P = W/t .... (waktu penggunaan mesin tak diketahui)