Sir, My doubt on cable sizing calculation, Load:74 KW calculated cable 1 run 50

Sir,
My doubt on cable sizing calculation, Load:74 KW calculated cable 1 run 50mm2. Now client asking us to reduce cable size by increasing runs.
Sir, My question now when my mind strikes with 2 options
1) Divide load 74/2 = 36 and calculate cable for 36+36 making it 2 runs or
2) Simply i can divide 50mm2 /2 ie. 2 runs of 25mm2

Please suggest me sir

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