- ETA-Effective access time - CMT-Cache memory time - MMT- Main memory time - Given-: - CMT=10microsec=10⋆10−6sec=10⋆10−3msec - MMT=10msec - Hit ratio =15% - EAT=(‌ hit ratio ‌)⋆(CMT+MMT)+(1−hit)⋆(CMT+2⋆MMT)....(1) - Putting values in equation (1)... - EAT =15∕100(0.001+10)+85∕100(0.001+2⋆10) - EAT =1.85msec