Very simple question if you think about it, if 1 butterfly is 0.56 grams, then 4 must be 0.56 x 4.
This is because to get from 1 to 4 you do 1 x 4 and the same must be done to 0.56.
I have worked out the answer for you;
0.56 x 4 = 2.24g
Also, remember the units. (g)
I hope this helped! ;3