Answer: B. 30%
Step-by-step explanation:
They bought the motorcycles for $2,100 and sold them for $1,000 each.
This means that they sold for a total of 1,000 x 3 = $3,000.
The markup was $3,000 minus the cost price of $2,100 which comes out to $900.
The markup percent would be the Markup amount over the selling price.
= 900/ 3000
= 0.3
= 30%
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