Rensing Ltd. estimates sales for the second quarter of 2017 will be as follows. Month Units April 2,560 May 2,440 June 2,370 The target ending inventory of finished products is as follows. March 31 2,050 April 30 2,210 May 31 2,170 June 30 2,320 2 units of material are required for each unit of finished product. Production for July is estimated at 2,800 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 50% of the following months production requirements. Raw materials are expected to cost $7 per unit throughout the period. Calculate the May raw materials purchases in dollars.