please tell me your answer, all the step to the answer and why, i got the answer

Question

please tell me your answer, all the step to the answer and why, i got the answer

Questions 28, 29, and 30 refer to the following information: A Carnot engine absorbs 900 J of heat each cycle and provides 350 J of work. QUESTION 28 What is its efficiency? (a) 257% efficient (b) 39% efficient (c) 61% efficient (d) 3% efficient QUESTION 29 How much heat is rejected each cycle? (a) 1450 J (b) 200 J (c) 900 J (d) 550 J QUESTION 30 If the engine rejects heat at 283 K, what's its maximum temperature? (a) 463K (b) 165K (c) 105 K (d) 4,630 K

Explanation / Answer

28 ) Efficiency =( Work done / Heat in ) * 100

   = ( 350/900)*100

   = 39 %

29) Heat rejected = Heat in - Work done

   = 900 J - 350 J

   = 550 J

30) heat in / T max = heat rejected / T min

Tmax = ( 283*900/550) = 463 K

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