Answer is Php 184.15
Explanation :-
Since Margie earned Php 100 on Saturday
Since Margie earned Php 55.65 on Sunday
Since Margie earned Php 28.50 on Monday
Then to get her earned on the 3 days, we will add the three amounts :

We will start adding the digits from right to left

Now , Add all the answers :

Hence, she earned Php 184.15 on the three days.