20 Applying those principles to the facts in this case, a term of immediate imprisonment was on 6 March 2008 and remains, the only appropriate sentencing option. The respondent had in her possession a total quantity of 25.47 g of prohibited drugs for sale or supply. The drugs in which she dealt, heroin, cocaine and methylamphetamine, are at the high end of the hierarchy of seriousness. The majority of that quantity ranged in purity from 21% to 26% which itself was significant. The purity of the cocaine (80%) was exceptionally high. It is apparent from these matters and the other indicia of drug trafficking, including the very significant quantity of cash in the respondent's possession, that she carried on business as a drug dealer at a relatively high level. There is no basis for an inference that the entire net income from her drug dealing enterprise was spent on drugs for her personal use. There is nothing mitigatory in the respondent's personal circumstances or antecedents. The fact that the respondent committed count 5 whilst on bail for the earlier offence underscores the need for personal deterrence. For the reasons explained in Saxild, general deterrence is also a predominant sentencing consideration.