To calculate the total cost for Dominic's three daughters to take gymnastics for a year, we first find the monthly cost for all three daughters and then multiply that by 12 months.
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Monthly cost for one child: $80
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Monthly cost for three daughters:
\( 3 \times 80 = 240 \) -
Cost for one year (12 months):
\( 240 \times 12 = 2880 \)
Therefore, Dominic needs to budget $2,880 for a year of gymnastics for his daughters.