A program consists of $1000$ assembly instructions, of which $30\%$ are load$/$store instructions, $10\%$ are jump instructions, $20\%$ are branch instructions, while the rest are arithmetic instructions. CPI for load$/$store$,$ jump, branch, and arithmetic instructions is $2\mathrm{.}5,1,1\mathrm{.}5,$ and $2,$ respectively. Assume that the processor has a $2$ GHz clock rate.