Tolong dijawab ya ka pelajaran kls 7

[tex]bunga\\ 2900000 - 2400000 = 500000 \\ \\ \frac{b}{12} \times \frac{10}{100} \times 2400000 = 500000 \\ b \times 20000 = 500000 \\ b = \frac{500000}{20000} \\ b = 25 \\ = 25 \: bulan[/tex]
maaf kalo salah