Hi!
Well, lets solve this problem together.
if Rickiesha saves $2 for 10 days, that's 2x10 or you could add 2 to 10, ten times (2+2+2+2+2+2+2+2+2+2)
Both equations add up to 20
So, your answer is D/4, 20
(you could also use the calculator and put it "2x10")
Hope this helps!