Let's assume the original price of the sofa is x.
According to the question, the sale price is 28% less than the original price, which means Frank paid 100% - 28% = 72% of the original price.
So, the sale price of the sofa is 72% of the original price, which is (72/100) * x = 342.
Therefore, the original price (x) of the sofa is x = 342 * 100 / 72 = $<<342*100/72=475>>475. Answer: \boxed{475}.
Frank bought a sofa on sale for $342 the price was 28% less than the original price what was the original price
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