The price of a stock decreased by $.60 one week decrease $.10 the next week and decreased another $.20 the following week what is the average change in the price of the stock over the three weeks

A - 270 per week

B - 90 cents per week

C - 87 cents per week

D - 30 cents per week

Add all the numbers together then divide by the amount of numbers you added together to find the average of anything.

For this problem you add. 60+.10+.20=.90 then divide. 90 by 3 because you agreed 3 numbers together ...90:3 =.30 so you are subtracting 30 cents per week or (-30)