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= 22/7 . 28 . 28
= 88 . 28
= 2464 m^2
L. link kecil = phi r^2
= 22/7 . 21 . 21
= 66 . 21
= 1386 cm^2
L. jln stpk = 2464 m^2 - 1386 m^2
= 1078 m^2
Harga = 1078 m^2 * Rp. 20.000
= Rp. 21.560.000 (C.)