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Step-by-step explanation:
100% = $3.40
1% = 100%/100 = 3.4 / 100 = 0.034
the price difference between 2015 and 2018 is
3.4 - 2.35 = 1.05
how many % of the original price in 2015 is this ?
1.05 / 0.034 ≈ 30.88
so, the price decrease was about 30.88%