Which amount is greater: 50% of 40 or 40% of 50?

None. They are equal.

Step-by-step explanation:

so x/40=50%/100

=20

x/50=40%/100

=20

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant