0 < x < 100

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Tom invested part of $8,000 at 3 percent and the rest at 5 percent annual interest for a total return of $340.

Sam invests a principal of $10,000, which earns interest over a period of years.

The algae on the surface of a pond increases in size by 10% each day. At night the algae on the surface of the same pond is reduced by 5%.

The price of an item was increased by 20 percent. The new price of the item was decreased by x percent, resulting in a final price that is 28 percent less than the original price.

A pack of 12 pens costs $ 72. If each pen is purchased individually it costs $ 7.

q>0

A discount of 5 percent on the listed price of an article was offered, reducing the profit by $120 that could have been earned if it were sold at the listed price.

The yearly rent collected by a firm from a property was p percent more in 2008 than that in 2007 and q percent less in 2009 than that in 2008. It is known that