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//Variable declaration:
Q = 20000 //Fuel input (Btu)
e = 1 //Energy produced (kW.h)
Btu = 3412 //Units Btu in 1 kW.h
//Calulation:
ER = Q/Btu //Energy requirement in 1990 (kW.h)
E = e/ER*100 //Efficiency of energy conversion (%)
//Result:
printf("The efficiency of energy conversion is : %.1f %%",E)
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