Expenditure increased = Expenditure in 1997 ? 98 - Expenditure in 1993 ? 94
Expenditure increased = 8800 ? 5100 = 3700.
From above diagram ,
The total number of students who come to school by car is represented in pie chart = 70°
The total number of students who come to school by bus is represented in pie chart = 90°
Required ratio = 70° : 90° = 7 : 9 = 21 : 27
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