In the country of Bahrain, the CPI is calculated using a market basket consisting of 2 apples, 2 loaves of bread, 1 robe and 1 gallon of gasoline. The per-unit prices are as follows:

Year Apples Bread Robes Gasoline

1999 $1.00 $1.50 $9.00 $1.00

2000 $1.00 $2.00 $10.00 $4.00

2001 $2.00 $2.00 $11.00 $2.00

2002 $3.00 $3.00 $15.00 $2.50

What was the inflation rate, as measured by the CPI, between 1999 and 2000_____?

1. 33%
2. It is impossible to determine without knowing the base year.
3. 66%
4. 10%