round problem

I have to calculate for d5(cost per piece) =(f5/5/3): f5 being the price per pece in another currency: e5=b5(quantity)* d5 to get the total value. I find that after the calculation if D5 show $0.60, and B5 has 200 pcs, instead of giving the value $120, it will give a lower figure, because I think the value used in d5 is not rounded off and probably the unrounded value is used i.e. $0.59872, is there a way I can get the value in D5 rounded so that the final value in E5 gives a correct result.??