acc vs budget

[#1]

Dear Friends

I have Follwoing issue that means

acctual vs budget   they have given summeraised budget figure for whole year but acctuals we have 8 months data only

so how i convert that budget figure into actuals

then finally value is 80%

how i t would come any i dea i am poor in maths

[#2]

hai

for above actual for 8months and budjet for 12 months

how i caluculate that budjet for 8 months