For the following question(s), suppose an economy produces only pens and pencils, and that the quantity and price data is given by this table:
| Pens | Pencils |
Year 1 quantity | 15 | 10 |
Year 1 price | $12 | $12 |
Year 2 quantity | 17 | 12 |
Year 2 price | $14 | $15 |
What is the inflation rate using base year 1?
◦ 20%
◦ 25%
◦ 10%
◦ 15%
◦ 13%