mohon bantuannya, terimakasih.

<p>Diket,</p><p>Roti A = 0,12kg tepung, 9/100kg gula, 2 butir telur</p><p>Roti B = 0,21kg tepung, 11/100kg gula, 3 butir telur</p><p>Roti C = 0,30kg tepung, 15/100kg gula, 2 butir telur</p><p>&nbsp;</p><p>Harga bahan, tepung = 12.000/kg</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;gula =18.000/kg</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;telur = 3.500/butir</p><p>&nbsp;</p><p>penyelesaian :</p><p>jumlah semua tepung untuk 3 macam roti = 0,12 + 0,21 + 0,30 = 0,53kg</p><p>jumlah semua gula untuk 3 macam roti = 9 + 11 + 15 = 35/100kg</p><p>jumlah semua telur untuk 3 macam roti = 2 + 3 + 2 = 7butir</p><p>&nbsp;</p><p>kalikan 50(untuk jumlah pembuatan kue) ~ 0,53 x 50 = 26,5kg tepung</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0,35 x 50 = 17,5kg gula</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 7 x 50 = 350butir</p><p>kalikan dengan harga tiap bahan ~ 26,5 x 12.000 = 318.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;17,5 x 18.000 = 315.000</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;350 x 3.500 = 1.225.000</p><p>jumlahkan total harga seluruh bahan ~ 318.000 + 315.000 + 1.225.000 = 1.858.000</p><p>&nbsp;</p><p>Jadi, uang yang harus dibayar kakak adalah 1.858.000 rupiah</p>