Calculators were purchased at $65 per dozen and sold at 20$ for three calculators. what is the profit on six dozen calculators

1 dozen of calculators = 12 calculators

Selling calculators at $20 for every 3 calculators is the same as selling calculators at $80 for every 12 calculators, or 1 dozen.

b=number of dozen of calculators bought, or 6

s=number of dozen of calculators sold, or 6

p=amount of profit

65 (b) - 80 (s) = |p|

65 (6) - 80 (6) = |p|

390-480=|p|

-90=|p|

90=p

The profit on six dozen calculators is $90.