Will the product of two numbers increase or decrease and by what percent if one of them is increased by 50%, and the other is decreased by 50%?

Answer 1

(1.5A)*(0.5B) = 0.75AB.
0.75AB/AB = 0.75 = 75%.
100% - 75% = 25% Decrease.

Answer 2

1.5*0.5= 0.75
1-0.75= 0.25
decrease by 25%