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Question:

A bike store is having a 30%-off sale, and one of the bikes is on sale for $385. What was the original price of this bike?

A $550.00
explanation

Set up an equation. The original price (p) minus 30% of the original price is $385.
p − 0.3p = 385
p = 385 ÷ 0.7
0.7p = 385
p = $550