a increased by 50% and decreased by 50% of the result
Let's assume that the original value of a is x.
If a is increased by 50%, it becomes 1.5x.
If this result is decreased by 50%, it becomes 0.75(1.5x) = 0.75*1.5x = 1.125x.
So, the final result is 1.125x, which is 112.5% of the original value of a.