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Abraxious
Four oranges cost 90 cents, an orange costs 90/4 cents, which is around 22.5 cents. Multiply this by 36 to get the cost of 3 dozen oranges, so 22.5 times 36 is 810, 810 cents, or 8.10 dollars.
musiclover10045

there would be 12 oranges per dozen

12/4 = 3 (3 sets of 4 per dozen)

3 * 90 cents = $2.70 per dozen

2.70 * 3 = $8.10 for 3 dozen