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luas akhir = 110%.sisi x 110%.sisi = 1,1.sisi x 1,1.sisi = 1,21.sisi²
pertambahan luas akhir = 1,21.sisi² - 1.sisi² = 0,21. sisi² = 0,21 x sisi² = 0,21 x luas awal.
simbol "." (dot) sama dengan "x" (kali).