Aaverage salary range for expat to work in Zanzibar, Tanzania?

Hi All,
I'm wondering if expat from Zanzibar, Tanzania could share his experience about expenses and salaries range for an engineering and management level position at Zanzibar, Tanzania.
I'm expecting in between USD 6 - 7K as a starting! Is it worthwhile?
Looking for your genuine advice.

Average salaries are low in Tanzania.  The average salary for civil engineer is $24,000 per annum. This may rise if you have good formal and educational qualifications coupled with years of work experience.

For living costs try www.numbeo.com

Thank you for your response!
Yes, I do have western postgrad-level qualifications coupled with several years of international experience.