Assignment:
A bakery makes a special marble rye bread using white flour, light rye flour, and dark rye flower. If they use three fifths as much light rye as dark rye but the amount of white flour is 20% of the amount of dark rye, how much light rye flour is needed to make a 1000 gram loaf? (assume the flour makes up all the weight of the finished loaf).
Provide complete and step by step solution for the question and show calculations and use formulas.