Perhatikan data mengenai jumlah penduduk di wilayah Y. Jika jumlah penduduk di kota B adalah 2.575 orang, maka penduduk kota C dan kota D adalah.... a. 4.020 orang b. 4.005 orang c. 3.985 orang d. 4.120 orang e. 4.135 orang

<p>Jawaban : 2.575 orang dan 3.090 orang.</p><p>&nbsp;</p><p>Ingat:</p><p>Perbandingan senilai:</p><p>A1/B1 = A2/B2</p><p>&nbsp;</p><p>Pembahasan:</p><p>Persentase kota D = 100% - 35% - 25% - 10% = 30%</p><p>&nbsp;</p><p>Banyak penduduk kota C:</p><p>Persentase kota C/persentase kota B = banyak penduduk kota C/banyak penduduk kota B</p><p>10% / 25% = x / 2.575</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2/5 = x/2.575</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5x = 2 × 2.575</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5x = 5.150</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; x = 5.150/5&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; x = 2.575 orang</p><p>&nbsp;</p><p>Banyak penduduk kota D:</p><p>Persentase kota D/persentase kota B = banyak penduduk kota D/banyak penduduk kota B</p><p>30% / 25% = y / 2.575</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;6/5 = y/2.575</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5y = &nbsp;6 × 2.575</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5y = 15.450</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; y = 15.450/5&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; y = 3.090 orang</p><p>&nbsp;</p><p>Jadi, banyak penduduk kota C dan D adalah &nbsp;2.575 orang dan 3.090 orang.</p>