Directions: The following pie chart shows the degree / percentage distribution of the usage of electricity (Number of units) in six different houses A, B, C, D, E and F in a month of May .

Total number of units consumed = 4000

Note : 

1)If the usage of the number of units in each house is below 500 the cost per unit is Rs. 30.

2) If the usage of the number of units in each house is above 500 the cost per unit is Rs. 40.