Math percentage question?

50ml of a solution of 50% dextrose is added to a liter of 0.45% NaCL with a 2.5% dextrose to yield a solution with a final dextrose concentration of w

50ml of a solution of 50% dextrose is added to a liter of 0.45% NaCL with a 2.5% dextrose to yield a solution with a final dextrose concentration of what percent?

or:50ml of a solution of 50% dextrose is added to a liter of 0.45% NaCL with a 2.5% dextrose to yield a solution with a final dextrose concentration of what percent?

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