Edna is living in a retirement home where most of her needs are taken care of, but she has some discretionary spending. Based on the basket of goods in Table 9.5, by what percentage does Edna's cost of living increase between time 1 and time 2? Items Quantity (Time 1) Price (Time 2) Price Gifts for grandchildren 12 $50 $60 Pizza delivery 24 $15 $16 Blouses 6 $60 $50 Vacation trips 2 $400 $420