Rensing Ltd. estimates sales for the second quarter of 2017 will be as follows. Month Units April 2,590 May 2,440 June 2,400 The target ending inventory of finished products is as follows. March 31 2,000 April 30 2,290 May 31 2,150 June 30 2,310 2 units of material are required for each unit of finished product. Production for July is estimated at 2,660 units to start building inventory for the fall sales period. Rensings policy is to have an inventory of raw materials at the end of each month equal to 40% of the following months production requirements. Raw materials are expected to cost $4 per unit throughout the period. Calculate the May raw materials purchases in dollars.