If we estimate that our tanks contain approximately 5 gallons (19 L) of river water, how much fertilizer(10% nitrogen) should we apply if we want to...

If we estimate that our tanks contain approximately 5 gallons (19 L) of river water, how much fertilizer(10% nitrogen) should we apply if we want to represent conventional nitrogen levels of 1.69 ug/ml? Show your calculation in the space below (Hint: 10% = 10,000 ppm = 10,000 ug/ml).