if a2=1000 and b2=1000 then c2=0
if a2=1000 and b2=1100 then c2=6
if a2=1000 and b2=1200 then c2=12
if a2=1100 ans b2=1200 then c2=6

this is what i want to do but excel
wont do it i need it as one formula , i havn't got macros available i need to know if it is possible