Sales tax is calculated

based on the number of items purchased.

using a percentage of the price of an item.

before a sale discount is applied.

as a percentage based on federal law.

The sales tax is calculated by using a percentage of the price of an item.

Idont know which one is right   but i know that c is wrong and a might be wrong

In financial aspects, a depression is a sustained, long haul downturn in monetary movement in one or more economies. it is a more extreme monetary downturn than a recession, which is a slowdown in financial action through the span of a typical business cycle. a depression is an irregular and extreme type of recession. so depression is always followed by recession but it is not correct to state that a depression always follow a recession.