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Ans 1:
Class : Class 4 
                                                                                                        
                                                                                                        for 1st hour Rs.15 + 10 +10 +10 +10 +10 +10 = Rs.75 { because every half hour he pays Rs.10 therefore for 3 additional hours he has to pay Rs.60 + 15 = 75}
                                                                                                    
                                                                                                    


