Please help me understand why these two questions use different methods for solving and how to use each way correctly

Manny bought 12 pounds of vegetables at the supermarket. 75% of the vegetables were on sale. how many pounds of vegetables were not on sale? 98 points : )

The coordinates of vortex a’ are (8,4) (-4,2) (4,-,4) the coordinates of vortex b’ are (6,6)(12,-,12)(12,12) the coordinates of vortex c’ are(-2,,12)(4,12)(12,-4)

Savannah had 40 iris blooms last year this year she had 15% more iris blooms how many more hours blooms did savannah have this year