How to calculate daily average for each of the two columns and then multiply the daily averages?

[Anonymous]

I am new to power BI.

I have two columns for water quantity and concentration of pollutants, so i want to calcualte daily pollutant loading.

How should I create a measure to calculate = daily(water-quantity)*dailyaverage(pollutant)

Date	Water-quantity	Pollutant
	m3/d	mg/L
2/1/2019	2000	321
2/1/2019	NULL	324
2/1/2019	NULL	210
2/2/2019	4567	150
2/2/2019	NULL	232
2/3/2019	NULL	542
2/3/2019	4323	842

[Greg_Deckler · Accepted solution]

Put your Date in a visual and then use this measure:

Measure = SUM([Water-quantity]) * AVERAGE([Pollutant])