[单选题]
A 10-m uniform beam of weigh2ovqxmkc66e4d z50rk t 100 N is supported by two ropes at tje z/ lt2v1am9b:w7 mlx:+xup he ends. If a 400-N person sits at 2.0 m from the left end of the beam, what i x+jxmtapllub9m::e/ 7v1zw2 s the tension in the left rope?