Answer:
0.75a
Explanation:
You want the result of a number 'a' being decreased by 50%, then increased by 50%.
Multiplier
The multiplier of the number is (1 + %change).
a(1 -50%) = 0.50a . . . . . . decreased by 50%
(0.50a)(1 +50%) = 0.75a . . . . . then increased by 50%
The result of the two changes by 50% is 0.75a.
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