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Panjang = a cm
Lebar = a -3 cm
Keliling = 2 x ( p + l )
54 = 2 x ( a + a - 3 )
54 : 2 = 2a - 3
27 + 3 = 2a
2a = 30
a = 15
Panjang = 15 meter
Lebar = 15 - 3 = 12 meter
Luas = 15 x 12
= 180 m²
Biaya = 180 x Rp. 4000,-
= Rp. 720.000,-
*jangan lupa bintangnya ya