I need a way to get the return number to increase by "1" after every increment of "10". Is there a more efficient way to do this other than:

`=SUM(IF(AC11<10,0,IF(AC11<20,1,IF(AC11<30,2,IF(AC11<40,3,IF(AC11<50,4,IF(AC11<60,5,IF(AC11<70,6,IF(AC11<80,7,IF(AC11<90,8,IF(AC11<100,9,IF(AC11<110,10,IF(AC11<120,11,IF(AC11<130,12,IF(AC11<140,13,IF(AC11<150,14,IF(AC11<160,15)))))))))))))))))`

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