Assume base CPI$=1$ without memory stalls; assume L$1$ hit occurs within base CPI. L$1$ access time$=1$ cycle $($accounted for within base CPI$),$ L$1$ miss rate$=10\%.$ L$2$ access time$=10$ cycles, L$2$ miss rate$=40\%.$ L$3$ access time$=50$ cycles, L$3$ miss rate$=80\%,$ Main memory access time $=100$ cycles.

$80\%$ of instructions access L$1$ data cache.

Find the AMAT of P$1$

Find the overall CPI of P$1$