\"\"\"\"

\

Original: 13.7

\

New: 40.2

\

Since the new amount is greater than the original, this is a percent of increase.

\

The amount of change = New Amount – Original Amount.

\

The amount of change = \"\".\"\"

\

Let r be the percentage of increase.

\

Use the original number, 13.7 as the base.

\

The percent proportion is

\

\"\"

\

\"\"

\

To solve for r, first find the cross products.

\

\"\"

\

\"\"                              (Multiply: \"\")

\

\"\"                 (Divide each side by 13.7)

\

\"\"                                        (Cancel common terms)

\

\"\"                             (Divide: \"\")

\

The percentage of increase by \"\".\"\"

\

The percent of change is a percent of increase.

\

The percentage of increase by \"\".