A uniform horizontal beam of length 2.0 m has a weight of 80 N acting at its centre. It is pivoted at its left end. A 120 N load hangs 1.5 m from the pivot. What upward force at the right end maintains rotational equilibrium?
90 N90\ \mathrm{N}90 N
260 N260\ \mathrm{N}260 N
130 N130\ \mathrm{N}130 N
100 N100\ \mathrm{N}100 N