What is the average CPI if a program contained $80\%$ arithmetic instructions, $10\%$

load$/$store instructions and $10\%$ branch instructions. Arithmetic instructions require

$3$ cycles, load$/$store instructions require $5$ cycles and branch instructions require $2$

cycles.

$10$

$9\mathrm{.}4$

$1\mathrm{.}1$

$3\mathrm{.}1$