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1 year = 12 months
2 1/4 years = 12 x 2 1/4 = 27 months
She saved $300 per month:
27 x 300 = $8100 ( total money saved)
She spent 40% of the money she saved on a family vacation.
Multiply by the percentage in decimal form (divided by 100)
8100 x 40/100 = $3240
Subtract that amount to the total money saved.
8100 - 3240 = 4860
Answer : 4860 (option B)