The Competition Commission has filed a new charge sheet with the Competition Tribunal involving 28 banks that are accused of manipulating the rand.
Authorities say the price of both grades of petrol will increase by R1.18 cents per litre from midnight on Tuesday.
The rand has weakened by 1% on Monday, trading at R18,93 to the dollar in mid-morning trade on the JSE.
The rand has continued to remain weak against a basket of currencies at opening trade on Monday morning.
Market analysts expect the rand and local stocks to come under more pressure when trading on the local bourse resumes on Monday.
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