The price of a laptop is decreased by 10% to $360. What is its original price?

A 400

explanation

Let 𝑥 be the original price.
If the price of a laptop is decreased by 10% to $360, then:
90% 𝑜𝑓 𝑥 = 360 ⇒ 0.90𝑥 = 360 ⇒ 𝑥 = 360 ÷ 0.90 = 400

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