Miamijim is almost correct. To pick a nit, (39/30)/(30/25) = 1.08333, making the double 8.33% higher than the triple. In turn, since (30/25)/(39/30) = 0.92307, the triple is 7.7% lower than the double. The difference is in which ratio one uses as the reference when computing the percentage change, i.e., 3 is 50% greater than 2, but 2 is 33% smaller than 3.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069