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Initial price = ₹400. Price after a 25% increase = 400 × (1 + 25/100) = 400 × 1.25 = ₹500. Price after a 20% decrease = 500 × (1 - 20/100) = 500 × 0.80 = ₹400. Thus, the final price is ₹400.
What would come next in the following letter series?
DWP, FUR, HST, JQV, _