Four housewives bought three different kinds of organic vegetables at a Goodprice supermarket. They cannot remember the individual prices per kilogram, but three of them can remember the total amount that they each paid. The weights of vegetables purchased and the total amounts paid are shown in the following table.
| Amy | Betty | Carol | Denise | |
|---|---|---|---|---|
| Pumpkins (kg) | 1.20 | 1.50 | 1.30 | 2.30 |
| Carrots (kg) | 2.50 | 2.70 | 2.60 | 3.10 |
| Broccoli (kg) | 1.25 | 1.35 | 1.10 | 2.10 |
| Total amount paid ($) | 21.86 | 25.20 | 21.90 | ? |
Given that, for each variety of vegetable, the price per kilogram paid by each of the housewives is the same, find the amount that Denise paid for her purchase.[4]
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