A farmer's land is in the shape of a trapezium which has its parallel sides measuring 6.32 yards and 7.68 yards and the distance between the parallel sides is 5.50 yards. The cost of ploughing the land is Rs 1200 per square yard. What amount have to be spend in order to plough the entire land?

Rs 46200

Area of a trapezium = $\frac{1}{2}$ (sum of parallel sides) x height 

 The area of land = $\frac{1}{2}$ (6.32 + 7.68) x 5.50

                          = $\frac{1}{2}$  x 14 x 5.50

                          =  38.5 yards square           

Cost of ploughing this land = Area x cost of ploughing per square yard

                                       = 38.5 x 1200

                                        =  Rs 46,200