Car Producer improving efficiency

A car producer aims at making an existing model more efficient. Because of the improvements the car should now use 6.3L of gasoline instead of 7L of gasoline pre 100km. How much more can the efficient car cost in order to still be competitive? Assuming average customer drives 20000km per year, pay-back-period of 3 years and gasoline prices is $1.30. 

 
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