If you have 50% dextrose and 15% dextrose, how many ml of each would you need to make 250 ml of 30% solution?

a. 150 ml of 50%, 100 ml of 15%
b. 200 ml of 50%, 50 ml of 15%
c. 100 ml of 50%, 150 ml of 15%
d. 120 ml of 50%, 130 ml of 15%