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OpenStudy (anonymous):
The cost per minute of a conference phone call, originally $2.80, increased by 20%. What is the new price?
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OpenStudy (stamp):
Original price increased by 20% = new price 100% increased by 20% = new price 100% + 20% = new price 120% of the original = new price 120% of $2.80 = new price 1.20(2.80) = n
OpenStudy (anonymous):
10% of $2.80 is $.28 20% is double that, .$56 .$2.80 + .56 $3.36
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