Vivian : Cynthia = 2 : 9. Vivian paid $12.<br><br>
&bull; 2 units = $12 → 1 unit = $6<br>
&bull; Cynthia paid = 9 × $6 = $54<br>
&bull; Total cost of present = $12 + $54 = $66<br>
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Final Answer: $66