60

(a)  

20

(a)  

90

(a)  

30

(a)  

40

(a)  

50

(a)  

70

(a)  

88

(a)  

51

(a)  

39

(a)  

75

(a)  

47

(a)  

42

(a)  

99

(a)  

86

(a)  

57

(a)