Mario took part in a race with charter boats. the whole race was 30km. sara gave him 500 leke for every full kilometer. mario gave sares 200 leke for every full kilometer he could not sail. the change was granted to the charity. marius gave 11500 leke for the charity. a) mario made a mile. make an equation about k and choose it. b) find the smallest number of miles that mario has to fill in so that he can contribute to the charity.