In the 21st Century the price of clothing is down but the quantity of clothing purchased is up 40%!

25%

Explanation:

In the 21st Century the price of clothing is down 25% but the quantity of clothing purchased is up 40%!

As a result of the reduction in the price of clothings and wears, there happened to be a corresponding increase in the demand for the clothes and wears. This is the logic happening because, since the price has lowered, more people would be able to afford it, and hence, more demand for it. Or say, increment in the quantity being purchased.

i think the answer is a. science center.

answer; competency based pay;