A bicycle component weighing 80 grams is redesigned to weigh 35% less. What is its new weight?

Explication

A 35% decrease leaves 65%, so 80 x 0.65 = 52 grams. The calculation 80 x 0.35 = 28 finds only the weight removed, while 45 subtracts a percent rate as though it were a number of grams.