What was the percent change in unit price when a box of tissues dropped from 200 to 150 tissues per box? (with no change in the price per box) ?

A) 25%
B) 20%
C) 30%
D) 35%
E) 33.3%

The percent change in unit price is calculated by the formula [(New Price - Old Price) / Old Price] * 100. When the quantity drops from 200 to 150 tissues per box with no change in price per box, the unit price increases because you're getting fewer tissues for the same amount of money. The old unit price is based on 200 tissues, and the new unit price is based on 150 tissues. The percent increase in unit price is 33.3%, calculated as [(1/150 - 1/200) / (1/200)] * 100 = 33.3%. This reflects that for each tissue, the price has increased by 33.3% because you're getting 50 fewer tissues for the same price.