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misalkan
panjang mula-mula = 100%
lebar mula-mula = 100%
maka
panjang baru = (100+5)% = 105%
lebar baru = (100-5)% = 95%
luas baru = 105% x 95% = 99,75%
→ luas baru 99,75% dari luas mula-mula