(i) Let the number of sugar crystals in 5 kg of sugar be x. The given information in the form of a table is as follows.

Amount of sugar (in kg) | 2 | 5 |

Number of crystals | 9 x 10^{6} | x |

The amount of sugar and the number of crystals it contains are directly proportional to each other. Therefore, we obtain

Hence, the number of sugar crystals is 2.25 × 10^{7}.

(ii) Let the number of sugar crystals in 1.2 kg of sugar be y. The given information in the form of a table is as follows.

Amount of sugar (in kg) | 2 | 1.2 |

Number of crystals | 9 x10^{6} | y |

Hence, the number of sugar crystals is 5.4 x 10^{6}