The monthly flexible overhead budget and activities of Forest Ltd. are as follows: Machine hours - 4,000; 5,200; 6,500 and Budgeted monthly overhead cost (Rs)- 98,000; 1,12,400; 1,28,000 respectively. The budgeted fixed overhead cost per month at the level of 6,800 machine hours is: a) Rs 30,000 b) Rs 40,000 c) Rs 45,000 d) Rs 50,000