In a survey conducted for three perfumes, it was found that 40% of the respondents used Fa, 25% used Havoc, 60% used Nido, 16% used none of the three perfumes whereas 15% of the respondents used exactly two of the three perfumes.   It is also found that 22% of the respondents used both Havoc and Nido. What percent o fthe respondents used only Fa?