A lever $($length $2\mathrm{.}1$ m$,$ mass $16\mathrm{.}3$ kg$)$ is supported in the middle by a fulcrum. On one end a mass is placed. The other end is attached to a spring $($k $=674$ N$/$m$).$ The system is in equilibrium when the spring is stretched up $33$ cm and the lever makes an angle of$$$=15$o$.$ What must be the normal force at the fulcrum?