MODELING REAL LIFE When the average price of an item increases from $p_1$ to $p_2$ over a period of $n$ years, the annual rate of inflation $r$ (in decimal form) is given by $r=\left(\frac{p_2}{p_1}\right)^{1/n}-1$
. Find the rate of inflation for each item in the table.

Per pound Per pound
2009 2019

Potatoes $0.620 $0.749

Oranges $0.910 $1.280

Ground beef $2.251 $3.775

Potatoes:
, or %

Oranges:
, or %

Ground beef:
, or %