If the efficiency of an engine is \( 50 \% \) and its work output is \( 500 \mathrm{~J} \), then...

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If the efficiency of an engine is \( 50 \% \) and its work output is \( 500 \mathrm{~J} \), then find the value of work input.
(a) \( 1000 \mathrm{~J} \)
(b) \( 500 \mathrm{~J} \)
(c) \( 100 \mathrm{~J} \)
(d) \( 250 \mathrm{~J} \)
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