In Ghana, we bargain for everything.... form food to transport to tuition fees to whatever. The trick is simple. Look your partner straight in the eye, stand straight, talk confidently, and look like you mean your words. In case of transportation with taxis, buying cloths,dresses, ... from 3cedis (5-20%) and you end at 7cedis. (5+20%). The better you become at bargaining, the lesser you will pay.