Communications gear maker Motorola Solutions Inc's quarterly profit rose 89 per cent, boosted by higher government spending on public safety. Net income from continuing operations rose to $336 million, or $1.18 per share, in the fourth quarter, from $177 million, or 54 cents per share, a year earlier. Revenue rose 6 per cent to $2.44 billion. Excluding items, the maker of two-way radios and public safety equipment earned $1.10 per share from continuing operations.