He charges $15 per hour to mow lawns and $20 per hour for gardening. He is only allowed to work for at most 20 hours per week.
His goal is to make at least $300 per week.

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters