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Realize "%" means "/100".
26 2/5% = 26.4% = 26.4/100 = 264/1000 = 0.264
Add 0.1 to 0.0(54) to get 0.1(54).
I dont know sorry i am also bad in math
S = 2 * (pi) * r * h.....for r
divide both sides by 2 * pi * h
s / (2(pi)h = r