A series LCR circuit consist of $\mathrm{R}=80\mathrm{\Omega },{\mathrm{X}}_{\mathrm{L}}=100\mathrm{\Omega }\text{ and }{\mathrm{X}}_{\mathrm{C}}=40\mathrm{\Omega }$. The input voltage is 2500 cos (100 $\mathrm{\pi }$t) V. The amplitude of current, in the circuit is ____A