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t = 25 cm = 25/100 m
L permukaan tabung = 2.La + Ka. t
= 2 (πr²) + 2πr.t
= 2πr (r+t)
= 2.22/7. 7/100 (7/100 + 25/100)
= 44/100 . 32/100
= 11/25. 8/25
= 88/625
a. Luas 4 tabung = 4 x 88/625
= 352/625 m²
b. Biaya = L 4 tabung x biaya/m²
= 352/625 x 2.500
= Rp 1.408