spreadsheet off by a penny or two

I have a spreadsheet that continues to have totals that are one or two pennies off. It seems that it is due to a cells formula '=SUM(C8*0.105)'. The multiplied decimal is 3 places, but I want the result to be in 2 decimal currency format. In different situations 'TRUNC(SUM(E8:E22), 2)' or 'ROUND(SUM(E8:E22), 2)' has done the trick. I have attached an example where the correct total for column E should be $1,290.06 and I always get the wrong total which is $1,290.04. Any assistance would be appreciated.